<?xml version='1.0' encoding='UTF-8'?>
<model name="BG51" xmlns="http://www.cellml.org/cellml/1.1#" xmlns:cellml="http://www.cellml.org/cellml/1.1#">
    <!-- Intracellular pH regulation-->
    <units name="dim">
        <unit units="dimensionless"/>
    </units>
    <units name="per_s">
        <unit exponent="-1" units="second"/>
    </units>
    <units name="mol_per_s">
        <unit units="mole"/>
        <unit exponent="-1" units="second"/>
    </units>
    <units name="per_mol">
        <unit exponent="-1" units="mole"/>
    </units>
    <units name="per_mol2">
        <unit exponent="-2" units="mole"/>
    </units>
    <units name="C_per_mol">
        <unit units="coulomb"/>
        <unit exponent="-1" units="mole"/>
    </units>
    <units name="J_per_mol">
        <unit units="joule"/>
        <unit exponent="-1" units="mole"/>
    </units>
    <units name="J_per_C">
        <unit units="joule"/>
        <unit exponent="-1" units="coulomb"/>
    </units>
    <units name="J_per_s">
        <unit units="joule"/>
        <unit exponent="-1" units="second"/>
    </units>
    <component name="main">
        <variable name="t" units="second"/>
        <variable initial_value="9.64853321e4" name="F" units="C_per_mol"/>
        <variable initial_value="2462.1911" name="RT" units="J_per_mol"/>
        <variable initial_value="-0.057" name="u_e_m" units="J_per_C"/>
        <variable name="epsilon" units="dim"/>
        <math xmlns="http://www.w3.org/1998/Math/MathML">
            <apply>
                <eq/>
                <ci>epsilon</ci>
                <apply>
                    <exp/>
                    <apply>
                        <divide/>
                        <apply>
                            <times/>
                            <ci>F</ci>
                            <ci>u_e_m</ci>
                        </apply>
                        <ci>RT</ci>
                    </apply>
                </apply>
            </apply>
        </math>
        <!-- state variables-->
        <variable initial_value="0.00765730077645094" name="q_CO2_i" units="mole"/>
        <variable name="q_CO2_o" units="mole"/>
        <variable initial_value="0.192342699223549" name="q_HCO3_i" units="mole"/>
        <variable name="q_HCO3_o" units="mole"/>
        <variable initial_value="3.981071705534970e-05" name="q_H_i" units="mole"/>
        <variable initial_value="1.995262314968879e-05" name="q_H_o" units="mole"/>
        <variable initial_value="1e-8" name="K_CO2_o" units="per_mol"/>
        <variable initial_value="1e-8" name="K_CO2_i" units="per_mol"/>
        <variable initial_value="1e-5" name="K_HCO3_o" units="per_mol"/>
        <variable initial_value="1e-5" name="K_HCO3_i" units="per_mol"/>
        <variable initial_value="1" name="K_H_o" units="per_mol"/>
        <variable initial_value="1" name="K_H_i" units="per_mol"/>
        <variable name="Q_CO2_o" units="dim"/>
        <variable name="Q_CO2_i" units="dim"/>
        <variable name="Q_HCO3_o" units="dim"/>
        <variable name="Q_HCO3_i" units="dim"/>
        <variable name="Q_H_o" units="dim"/>
        <variable name="Q_H_i" units="dim"/>
        <math xmlns="http://www.w3.org/1998/Math/MathML">
            <apply>
                <eq/>
                <ci>Q_CO2_o</ci>
                <apply>
                    <times/>
                    <ci>K_CO2_o</ci>
                    <ci>q_CO2_o</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>Q_CO2_i</ci>
                <apply>
                    <times/>
                    <ci>K_CO2_i</ci>
                    <ci>q_CO2_i</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>Q_HCO3_o</ci>
                <apply>
                    <times/>
                    <ci>K_HCO3_o</ci>
                    <ci>q_HCO3_o</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>Q_HCO3_i</ci>
                <apply>
                    <times/>
                    <ci>K_HCO3_i</ci>
                    <ci>q_HCO3_i</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>Q_H_o</ci>
                <apply>
                    <times/>
                    <ci>K_H_o</ci>
                    <ci>q_H_o</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>Q_H_i</ci>
                <apply>
                    <times/>
                    <ci>K_H_i</ci>
                    <ci>q_H_i</ci>
                </apply>
            </apply>
            <!-- step change in external CO2-->
            <apply>
                <eq/>
                <ci>q_CO2_o</ci>
                <piecewise>
                    <piece>
                        <cn cellml:units="mole">0.00765730077645094</cn>
                        <apply>
                            <lt/>
                            <ci>t</ci>
                            <cn cellml:units="second">100</cn>
                        </apply>
                    </piece>
                    <piece>
                        <cn cellml:units="mole">1.1877</cn>
                        <apply>
                            <lt/>
                            <ci>t</ci>
                            <cn cellml:units="second">2800</cn>
                        </apply>
                    </piece>
                    <otherwise>
                        <cn cellml:units="mole">0.00765730077645094</cn>
                    </otherwise>
                </piecewise>
            </apply>
        </math>
        <variable name="v_CO2_m" units="mol_per_s"/>
        <variable initial_value="1.490e+07" name="v_CO2_max" units="mol_per_s"/>
        <variable initial_value="1.837e-01" name="gamma_CO2" units="dim"/>
        <math xmlns="http://www.w3.org/1998/Math/MathML">
            <apply>
                <eq/>
                <ci>v_CO2_m</ci>
                <apply>
                    <divide/>
                    <apply>
                        <times/>
                        <ci>v_CO2_max</ci>
                        <apply>
                            <minus/>
                            <ci>Q_CO2_o</ci>
                            <ci>Q_CO2_i</ci>
                        </apply>
                    </apply>
                    <apply>
                        <plus/>
                        <apply>
                            <divide/>
                            <apply>
                                <times/>
                                <cn cellml:units="dim">2</cn>
                                <ci>gamma_CO2</ci>
                            </apply>
                            <apply>
                                <plus/>
                                <cn cellml:units="dim">1</cn>
                                <ci>gamma_CO2</ci>
                            </apply>
                        </apply>
                        <ci>Q_CO2_o</ci>
                        <ci>Q_CO2_i</ci>
                        <apply>
                            <times/>
                            <apply>
                                <divide/>
                                <cn cellml:units="dim">2</cn>
                                <apply>
                                    <plus/>
                                    <cn cellml:units="dim">1</cn>
                                    <ci>gamma_CO2</ci>
                                </apply>
                            </apply>
                            <ci>Q_CO2_o</ci>
                            <ci>Q_CO2_i</ci>
                        </apply>
                    </apply>
                </apply>
            </apply>
        </math>
        <variable name="v_HCO3_m" units="mol_per_s"/>
        <variable initial_value="10.01" name="kappa_HCO3_m" units="mol_per_s"/>
        <math xmlns="http://www.w3.org/1998/Math/MathML">
            <apply>
                <eq/>
                <ci>v_HCO3_m</ci>
                <apply>
                    <times/>
                    <ci>kappa_HCO3_m</ci>
                    <apply>
                        <minus/>
                        <apply>
                            <times/>
                            <ci>Q_HCO3_o</ci>
                            <ci>epsilon</ci>
                        </apply>
                        <ci>Q_HCO3_i</ci>
                    </apply>
                </apply>
            </apply>
        </math>
        <variable name="v_H_m" units="mol_per_s"/>
        <variable initial_value="10" name="kappa_H_m" units="mol_per_s"/>
        <math xmlns="http://www.w3.org/1998/Math/MathML">
            <apply>
                <eq/>
                <ci>v_H_m</ci>
                <apply>
                    <times/>
                    <ci>kappa_H_m</ci>
                    <apply>
                        <minus/>
                        <ci>Q_H_o</ci>
                        <apply>
                            <times/>
                            <ci>Q_H_i</ci>
                            <ci>epsilon</ci>
                        </apply>
                    </apply>
                </apply>
            </apply>
        </math>
        <variable name="v_H2CO3_o" units="mol_per_s"/>
        <variable name="v_H2CO3_i" units="mol_per_s"/>
        <variable initial_value="1e8" name="kappa_H2CO3" units="mol_per_s"/>
        <math xmlns="http://www.w3.org/1998/Math/MathML">
            <apply>
                <eq/>
                <ci>v_H2CO3_o</ci>
                <apply>
                    <times/>
                    <ci>kappa_H2CO3</ci>
                    <apply>
                        <minus/>
                        <ci>Q_CO2_o</ci>
                        <apply>
                            <times/>
                            <ci>Q_HCO3_o</ci>
                            <ci>Q_H_o</ci>
                        </apply>
                    </apply>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>v_H2CO3_i</ci>
                <apply>
                    <times/>
                    <ci>kappa_H2CO3</ci>
                    <apply>
                        <minus/>
                        <ci>Q_CO2_i</ci>
                        <apply>
                            <times/>
                            <ci>Q_HCO3_i</ci>
                            <ci>Q_H_i</ci>
                        </apply>
                    </apply>
                </apply>
            </apply>
            <!-- conservation equations-->
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>q_CO2_i</ci>
                </apply>
                <apply>
                    <minus/>
                    <ci>v_CO2_m</ci>
                    <ci>v_H2CO3_i</ci>
                </apply>
            </apply>
            <!--   ode(q_HCO3_o, t) = -v_HCO3_m+v_H2CO3_o;-->
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>q_HCO3_i</ci>
                </apply>
                <apply>
                    <plus/>
                    <ci>v_HCO3_m</ci>
                    <ci>v_H2CO3_i</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>q_HCO3_o</ci>
                <apply>
                    <divide/>
                    <apply>
                        <times/>
                        <ci>K_HA</ci>
                        <ci>q_CO2_o</ci>
                    </apply>
                    <ci>q_H_o</ci>
                </apply>
            </apply>
            <!-- ode(q_H_o, t) = -v_H_m+v_H2CO3_o;-->
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>q_H_i</ci>
                </apply>
                <apply>
                    <plus/>
                    <ci>v_H_m</ci>
                    <ci>v_H2CO3_i</ci>
                </apply>
            </apply>
        </math>
        <variable name="pH_i" units="dim"/>
        <variable name="pH_o" units="dim"/>
        <math xmlns="http://www.w3.org/1998/Math/MathML">
            <apply>
                <eq/>
                <ci>pH_i</ci>
                <apply>
                    <minus/>
                    <apply>
                        <log/>
                        <apply>
                            <times/>
                            <cn cellml:units="per_mol" type="e-notation">1<sep/>-3</cn>
                            <ci>q_H_i</ci>
                        </apply>
                    </apply>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>pH_o</ci>
                <apply>
                    <minus/>
                    <apply>
                        <log/>
                        <apply>
                            <times/>
                            <cn cellml:units="per_mol" type="e-notation">1<sep/>-3</cn>
                            <ci>q_H_o</ci>
                        </apply>
                    </apply>
                </apply>
            </apply>
        </math>
        <variable name="alpha" units="dimensionless"/>
        <variable initial_value="1e-3" name="K_HA" units="mole"/>
        <variable initial_value="1" name="q_TA_i" units="mole"/>
        <variable initial_value="5.011872336272725e-05" name="q_H_Lim" units="mole"/>
        <variable name="pH_Lim" units="dim"/>
        <variable initial_value="26" name="beta" units="mole"/>
        <math xmlns="http://www.w3.org/1998/Math/MathML">
            <apply>
                <eq/>
                <ci>pH_Lim</ci>
                <apply>
                    <minus/>
                    <apply>
                        <log/>
                        <apply>
                            <times/>
                            <cn cellml:units="per_mol" type="e-notation">1<sep/>-3</cn>
                            <ci>q_H_Lim</ci>
                        </apply>
                    </apply>
                </apply>
            </apply>
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>q_TA_i</ci>
                </apply>
                <apply>
                    <plus/>
                    <ci>v_CO2_m</ci>
                    <ci>v_HCO3_m</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>alpha</ci>
                <apply>
                    <divide/>
                    <ci>q_H_i</ci>
                    <apply>
                        <plus/>
                        <ci>q_H_i</ci>
                        <ci>K_HA</ci>
                    </apply>
                </apply>
            </apply>
        </math>
        <!-- Power-->
        <variable name="PC_CO2_i" units="J_per_s"/>
        <variable name="PC_HCO3_i" units="J_per_s"/>
        <variable name="PC_H_i" units="J_per_s"/>
        <variable name="PC_CO2_o" units="J_per_s"/>
        <variable name="PC_HCO3_o" units="J_per_s"/>
        <variable name="PC_H_o" units="J_per_s"/>
        <variable name="PRe_CO2_m" units="J_per_s"/>
        <variable name="PRe_HCO3_m" units="J_per_s"/>
        <variable name="PRe_H_m" units="J_per_s"/>
        <variable name="PRe_HCO3_i" units="J_per_s"/>
        <variable name="P_um" units="J_per_s"/>
        <variable name="P_supply" units="J_per_s"/>
        <variable name="P_absorb" units="J_per_s"/>
        <math xmlns="http://www.w3.org/1998/Math/MathML">
            <apply>
                <eq/>
                <ci>PC_CO2_o</ci>
                <apply>
                    <times/>
                    <apply>
                        <minus/>
                        <ci>RT</ci>
                    </apply>
                    <apply>
                        <ln/>
                        <ci>Q_CO2_o</ci>
                    </apply>
                    <ci>v_CO2_m</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>PC_CO2_i</ci>
                <apply>
                    <times/>
                    <ci>RT</ci>
                    <apply>
                        <ln/>
                        <ci>Q_CO2_i</ci>
                    </apply>
                    <apply>
                        <minus/>
                        <ci>v_CO2_m</ci>
                        <ci>v_H2CO3_i</ci>
                    </apply>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>PC_HCO3_o</ci>
                <apply>
                    <times/>
                    <apply>
                        <minus/>
                        <ci>RT</ci>
                    </apply>
                    <apply>
                        <ln/>
                        <ci>Q_HCO3_o</ci>
                    </apply>
                    <ci>v_HCO3_m</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>PC_HCO3_i</ci>
                <apply>
                    <times/>
                    <ci>RT</ci>
                    <apply>
                        <ln/>
                        <ci>Q_HCO3_i</ci>
                    </apply>
                    <apply>
                        <plus/>
                        <ci>v_HCO3_m</ci>
                        <ci>v_H2CO3_i</ci>
                    </apply>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>PC_H_o</ci>
                <apply>
                    <times/>
                    <apply>
                        <minus/>
                        <ci>RT</ci>
                    </apply>
                    <apply>
                        <ln/>
                        <ci>Q_H_o</ci>
                    </apply>
                    <ci>v_H_m</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>PC_H_i</ci>
                <apply>
                    <times/>
                    <ci>RT</ci>
                    <apply>
                        <ln/>
                        <ci>Q_H_i</ci>
                    </apply>
                    <apply>
                        <plus/>
                        <ci>v_H_m</ci>
                        <ci>v_H2CO3_i</ci>
                    </apply>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>PRe_CO2_m</ci>
                <apply>
                    <times/>
                    <apply>
                        <minus/>
                        <apply>
                            <times/>
                            <ci>RT</ci>
                            <apply>
                                <ln/>
                                <ci>Q_CO2_o</ci>
                            </apply>
                        </apply>
                        <apply>
                            <times/>
                            <ci>RT</ci>
                            <apply>
                                <ln/>
                                <ci>Q_CO2_i</ci>
                            </apply>
                        </apply>
                    </apply>
                    <ci>v_CO2_m</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>PRe_HCO3_m</ci>
                <apply>
                    <times/>
                    <apply>
                        <minus/>
                        <apply>
                            <plus/>
                            <apply>
                                <times/>
                                <ci>RT</ci>
                                <apply>
                                    <ln/>
                                    <ci>Q_HCO3_o</ci>
                                </apply>
                            </apply>
                            <apply>
                                <times/>
                                <ci>F</ci>
                                <ci>u_e_m</ci>
                            </apply>
                        </apply>
                        <apply>
                            <times/>
                            <ci>RT</ci>
                            <apply>
                                <ln/>
                                <ci>Q_HCO3_i</ci>
                            </apply>
                        </apply>
                    </apply>
                    <ci>v_HCO3_m</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>PRe_H_m</ci>
                <apply>
                    <times/>
                    <apply>
                        <minus/>
                        <apply>
                            <minus/>
                            <apply>
                                <times/>
                                <ci>RT</ci>
                                <apply>
                                    <ln/>
                                    <ci>Q_H_o</ci>
                                </apply>
                            </apply>
                            <apply>
                                <times/>
                                <ci>F</ci>
                                <ci>u_e_m</ci>
                            </apply>
                        </apply>
                        <apply>
                            <times/>
                            <ci>RT</ci>
                            <apply>
                                <ln/>
                                <ci>Q_H_i</ci>
                            </apply>
                        </apply>
                    </apply>
                    <ci>v_H_m</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>P_um</ci>
                <apply>
                    <minus/>
                    <apply>
                        <times/>
                        <ci>F</ci>
                        <ci>u_e_m</ci>
                        <ci>v_H_m</ci>
                    </apply>
                    <apply>
                        <times/>
                        <ci>F</ci>
                        <ci>u_e_m</ci>
                        <ci>v_HCO3_m</ci>
                    </apply>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>PRe_HCO3_i</ci>
                <apply>
                    <times/>
                    <apply>
                        <minus/>
                        <apply>
                            <minus/>
                            <apply>
                                <times/>
                                <ci>RT</ci>
                                <apply>
                                    <ln/>
                                    <ci>Q_CO2_i</ci>
                                </apply>
                            </apply>
                            <apply>
                                <times/>
                                <ci>RT</ci>
                                <apply>
                                    <ln/>
                                    <ci>Q_HCO3_i</ci>
                                </apply>
                            </apply>
                        </apply>
                        <apply>
                            <times/>
                            <ci>RT</ci>
                            <apply>
                                <ln/>
                                <ci>Q_H_i</ci>
                            </apply>
                        </apply>
                    </apply>
                    <ci>v_H2CO3_i</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>P_supply</ci>
                <apply>
                    <plus/>
                    <ci>PC_CO2_o</ci>
                    <ci>PC_HCO3_o</ci>
                    <ci>PC_H_o</ci>
                    <ci>P_um</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <ci>P_absorb</ci>
                <apply>
                    <plus/>
                    <ci>PC_CO2_i</ci>
                    <ci>PC_HCO3_i</ci>
                    <ci>PC_H_i</ci>
                    <ci>PRe_CO2_m</ci>
                    <ci>PRe_HCO3_m</ci>
                    <ci>PRe_H_m</ci>
                    <ci>PRe_HCO3_i</ci>
                </apply>
            </apply>
        </math>
        <!-- Activity-->
        <variable initial_value="0" name="AC_CO2_i" units="joule"/>
        <variable initial_value="0" name="AC_HCO3_i" units="joule"/>
        <variable initial_value="0" name="AC_H_i" units="joule"/>
        <variable initial_value="0" name="AC_CO2_o" units="joule"/>
        <variable initial_value="0" name="AC_HCO3_o" units="joule"/>
        <variable initial_value="0" name="AC_H_o" units="joule"/>
        <variable initial_value="0" name="ARe_CO2_m" units="joule"/>
        <variable initial_value="0" name="ARe_HCO3_m" units="joule"/>
        <variable initial_value="0" name="ARe_H_m" units="joule"/>
        <variable initial_value="0" name="ARe_HCO3_i" units="joule"/>
        <variable initial_value="0" name="A_um" units="joule"/>
        <variable initial_value="0" name="E_supply" units="joule"/>
        <variable initial_value="0" name="E_absorb" units="joule"/>
        <variable initial_value="0" name="A_supply" units="joule"/>
        <variable initial_value="0" name="A_absorb" units="joule"/>
        <math xmlns="http://www.w3.org/1998/Math/MathML">
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>AC_CO2_o</ci>
                </apply>
                <apply>
                    <abs/>
                    <ci>PC_CO2_o</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>AC_CO2_i</ci>
                </apply>
                <apply>
                    <abs/>
                    <ci>PC_CO2_i</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>AC_HCO3_o</ci>
                </apply>
                <apply>
                    <abs/>
                    <ci>PC_HCO3_o</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>AC_HCO3_i</ci>
                </apply>
                <apply>
                    <abs/>
                    <ci>PC_HCO3_i</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>AC_H_o</ci>
                </apply>
                <apply>
                    <abs/>
                    <ci>PC_H_o</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>AC_H_i</ci>
                </apply>
                <apply>
                    <abs/>
                    <ci>PC_H_i</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>ARe_CO2_m</ci>
                </apply>
                <apply>
                    <abs/>
                    <ci>PRe_CO2_m</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>ARe_HCO3_m</ci>
                </apply>
                <apply>
                    <abs/>
                    <ci>PRe_HCO3_m</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>ARe_H_m</ci>
                </apply>
                <apply>
                    <abs/>
                    <ci>PRe_H_m</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>A_um</ci>
                </apply>
                <apply>
                    <abs/>
                    <ci>P_um</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>ARe_HCO3_i</ci>
                </apply>
                <apply>
                    <abs/>
                    <ci>PRe_HCO3_i</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>E_supply</ci>
                </apply>
                <ci>P_supply</ci>
            </apply>
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>E_absorb</ci>
                </apply>
                <ci>P_absorb</ci>
            </apply>
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>A_supply</ci>
                </apply>
                <apply>
                    <abs/>
                    <ci>P_supply</ci>
                </apply>
            </apply>
            <apply>
                <eq/>
                <apply>
                    <diff/>
                    <bvar>
                        <ci>t</ci>
                    </bvar>
                    <ci>A_absorb</ci>
                </apply>
                <apply>
                    <abs/>
                    <ci>P_absorb</ci>
                </apply>
            </apply>
        </math>
    </component>
</model>
