C
C There are a total of 15 entries in the algebraic variable array.
C There are a total of 1 entries in each of the rate and state variable arrays.
C There are a total of 18 entries in the constant variable array.
C
C
C VOI is time in component environment (second).
C CONSTS(1) is C_ext_Na in component Concentrations (mM).
C CONSTS(2) is C_ext_H in component Concentrations (mM).
C CONSTS(3) is C_ext_NH4 in component Concentrations (mM).
C CONSTS(4) is C_int_Na in component Concentrations (mM).
C ALGBRC(1) is C_int_H in component Concentrations (mM).
C CONSTS(5) is C_int_NH4 in component Concentrations (mM).
C STATES(1) is pH_int in component Concentrations (dimensionless).
C CONSTS(6) is XTxP0_NHE3_Na in component NHE3_Parameters (nmol_per_s_per_cm2).
C CONSTS(7) is XTxP0_NHE3_H in component NHE3_Parameters (nmol_per_s_per_cm2).
C CONSTS(8) is XTxP0_NHE3_NH4 in component NHE3_Parameters (nmol_per_s_per_cm2).
C CONSTS(9) is K_NHE3_Na in component NHE3_Parameters (mM).
C CONSTS(10) is K_NHE3_H in component NHE3_Parameters (mM).
C CONSTS(11) is K_NHE3_NH4 in component NHE3_Parameters (mM).
C ALGBRC(3) is XTxP_NHE3_Na in component NHE3 (nmol_per_s_per_cm2).
C ALGBRC(4) is XTxP_NHE3_H in component NHE3 (nmol_per_s_per_cm2).
C ALGBRC(5) is XTxP_NHE3_NH4 in component NHE3 (nmol_per_s_per_cm2).
C CONSTS(12) is alpha_ext_Na in component NHE3 (dimensionless).
C CONSTS(13) is beta_ext_H in component NHE3 (dimensionless).
C CONSTS(14) is gamma_ext_NH4 in component NHE3 (dimensionless).
C CONSTS(15) is alpha_int_Na in component NHE3 (dimensionless).
C ALGBRC(2) is beta_int_H in component NHE3 (dimensionless).
C CONSTS(16) is gamma_int_NH4 in component NHE3 (dimensionless).
C ALGBRC(6) is sum_NHE3 in component NHE3 (nmol_per_s_per_cm2).
C ALGBRC(7) is J_NHE3_Na in component NHE3 (nmol_per_s_per_cm2).
C ALGBRC(8) is J_NHE3_H in component NHE3 (nmol_per_s_per_cm2).
C ALGBRC(9) is J_NHE3_NH4 in component NHE3 (nmol_per_s_per_cm2).
C CONSTS(17) is J_NHE3_Na_Max in component NHE3 (nmol_per_s_per_cm2).
C ALGBRC(11) is plot in component NHE3 (dimensionless).
C ALGBRC(12) is J_NHE3_Na2 in component NHE3 (nmol_per_s_per_cm2).
C ALGBRC(13) is J_NHE3_H2 in component NHE3 (nmol_per_s_per_cm2).
C ALGBRC(14) is J_NHE3_NH42 in component NHE3 (nmol_per_s_per_cm2).
C ALGBRC(10) is sum0_NHE3 in component NHE3 (nmol_per_s_per_cm2).
C ALGBRC(15) is plot2 in component NHE3 (dimensionless).
C RATES(1) is d/dt pH_int in component Concentrations (dimensionless).
C
      SUBROUTINE initConsts(CONSTS, RATES, STATES)
      REAL CONSTS(*), RATES(*), STATES(*)
      CONSTS(1) = 1
      CONSTS(2) = 5.4954e-5
      CONSTS(3) = 0
      CONSTS(4) = 0
      CONSTS(5) = 0
      STATES(1) = 4
      CONSTS(6) = 1.6e-3
      CONSTS(7) = 0.48e-3
      CONSTS(8) = 1.6e-3
      CONSTS(9) = 30
      CONSTS(10) = 72e-6
      CONSTS(11) = 0.027e3
      CONSTS(12) = CONSTS(1)/CONSTS(9)
      CONSTS(17) = 5.00000
      CONSTS(13) = CONSTS(2)/CONSTS(10)
      CONSTS(14) = CONSTS(3)/CONSTS(11)
      CONSTS(15) = CONSTS(4)/CONSTS(9)
      CONSTS(16) = CONSTS(5)/CONSTS(11)
      CONSTS(17) = ( CONSTS(6)*CONSTS(7))/(CONSTS(6)+CONSTS(7))
      RETURN
      END
      SUBROUTINE computeRates(VOI, CONSTS,  RATES, STATES, ALGBRC)
      REAL VOI, CONSTS(*), RATES(*), STATES(*), ALGBRC(*)
      RATES(1) = CONSTS(17)
      RETURN
      END
      SUBROUTINE computeVariables(VOI, CONSTS, RATES, STATES, ALGBRC)
      REAL VOI, CONSTS(*), RATES(*), STATES(*), ALGBRC(*)
      ALGBRC(1) =  1000.00*10.0000 ** - STATES(1)
      ALGBRC(2) = ALGBRC(1)/CONSTS(10)
      ALGBRC(3) = ( CONSTS(6)*2.00000*ALGBRC(1))/(ALGBRC(1)+0.00100000)
      ALGBRC(4) = ( CONSTS(7)*2.00000*ALGBRC(1))/(ALGBRC(1)+0.00100000)
      ALGBRC(5) = ( CONSTS(8)*2.00000*ALGBRC(1))/(ALGBRC(1)+0.00100000)
      ALGBRC(6) =  (1.00000+CONSTS(12)+CONSTS(13)+CONSTS(14))*( ALGBRC(3)*CONSTS(15)+ ALGBRC(4)*ALGBRC(2)+ ALGBRC(5)*CONSTS(16))+ (1.00000+CONSTS(15)+ALGBRC(2)+CONSTS(16))*( ALGBRC(3)*CONSTS(12)+ ALGBRC(4)*CONSTS(13)+ ALGBRC(5)*CONSTS(14))
      ALGBRC(7) =  (( ALGBRC(3)*ALGBRC(4))/ALGBRC(6))*( CONSTS(12)*ALGBRC(2) -  CONSTS(15)*CONSTS(13))+ (( ALGBRC(3)*ALGBRC(5))/ALGBRC(6))*( CONSTS(12)*CONSTS(16) -  CONSTS(15)*CONSTS(14))
      ALGBRC(8) =  (( ALGBRC(3)*ALGBRC(4))/ALGBRC(6))*( CONSTS(15)*CONSTS(13) -  CONSTS(12)*ALGBRC(2))+ (( ALGBRC(4)*ALGBRC(5))/ALGBRC(6))*( CONSTS(13)*CONSTS(16) -  ALGBRC(2)*CONSTS(14))
      ALGBRC(9) =  (( ALGBRC(3)*ALGBRC(5))/ALGBRC(6))*( CONSTS(15)*CONSTS(14) -  CONSTS(12)*CONSTS(16))+ (( ALGBRC(4)*ALGBRC(5))/ALGBRC(6))*( CONSTS(14)*ALGBRC(2) -  CONSTS(13)*CONSTS(16))
      ALGBRC(10) =  (1.00000+CONSTS(12)+CONSTS(13)+CONSTS(14))*( CONSTS(6)*CONSTS(15)+ CONSTS(7)*ALGBRC(2)+ CONSTS(8)*CONSTS(16))+ (1.00000+CONSTS(15)+ALGBRC(2)+CONSTS(16))*( CONSTS(6)*CONSTS(12)+ CONSTS(7)*CONSTS(13)+ CONSTS(8)*CONSTS(14))
      ALGBRC(11) = ALGBRC(7)/CONSTS(17)
      ALGBRC(12) =  (( CONSTS(6)*CONSTS(7))/ALGBRC(10))*( CONSTS(12)*ALGBRC(2) -  CONSTS(15)*CONSTS(13))+ (( CONSTS(6)*CONSTS(8))/ALGBRC(6))*( CONSTS(12)*CONSTS(16) -  CONSTS(15)*CONSTS(14))
      ALGBRC(13) =  (( CONSTS(6)*CONSTS(7))/ALGBRC(10))*( CONSTS(15)*CONSTS(13) -  CONSTS(12)*ALGBRC(2))+ (( CONSTS(7)*CONSTS(8))/ALGBRC(6))*( CONSTS(13)*CONSTS(16) -  ALGBRC(2)*CONSTS(14))
      ALGBRC(14) =  (( CONSTS(6)*CONSTS(8))/ALGBRC(10))*( CONSTS(15)*CONSTS(14) -  CONSTS(12)*CONSTS(16))+ (( CONSTS(7)*CONSTS(8))/ALGBRC(6))*( CONSTS(14)*ALGBRC(2) -  CONSTS(13)*CONSTS(16))
      ALGBRC(15) = ALGBRC(12)/CONSTS(17)
      RETURN
      END