C
C There are a total of 8 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 22 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 ALGBRC(1) is C_ext_H in component Concentrations (mM).
C CONSTS(2) is C_ext_NH4 in component Concentrations (mM).
C CONSTS(3) is C_int_Na in component Concentrations (mM).
C CONSTS(4) is C_int_H in component Concentrations (mM).
C CONSTS(5) is C_int_NH4 in component Concentrations (mM).
C STATES(1) is pH_ext 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 CONSTS(17) is XTxP_NHE_Na in component NHE3 (nmol_per_s_per_cm2).
C CONSTS(18) is XTxP_NHE_H in component NHE3 (nmol_per_s_per_cm2).
C CONSTS(19) is XTxP_NHE_NH4 in component NHE3 (nmol_per_s_per_cm2).
C CONSTS(12) is alpha_ext_Na in component NHE3 (dimensionless).
C ALGBRC(2) is beta_ext_H in component NHE3 (dimensionless).
C CONSTS(13) is gamma_ext_NH4 in component NHE3 (dimensionless).
C CONSTS(14) is alpha_int_Na in component NHE3 (dimensionless).
C CONSTS(15) is beta_int_H in component NHE3 (dimensionless).
C CONSTS(16) is gamma_int_NH4 in component NHE3 (dimensionless).
C ALGBRC(3) is sum_NHE3 in component NHE3 (nmol_per_s_per_cm2).
C ALGBRC(4) is J_NHE3_Na in component NHE3 (nmol_per_s_per_cm2).
C ALGBRC(5) is J_NHE3_H in component NHE3 (nmol_per_s_per_cm2).
C ALGBRC(6) is J_NHE3_NH4 in component NHE3 (nmol_per_s_per_cm2).
C CONSTS(21) is J_NHE3_Na_Max in component NHE3 (nmol_per_s_per_cm2).
C ALGBRC(8) is plot_b in component NHE3 (dimensionless).
C ALGBRC(7) is plot_a in component NHE3 (dimensionless).
C CONSTS(20) is K_H in component NHE3 (dimensionless).
C RATES(1) is d/dt pH_ext in component Concentrations (dimensionless).
C
      SUBROUTINE initConsts(CONSTS, RATES, STATES)
      REAL CONSTS(*), RATES(*), STATES(*)
      CONSTS(1) = 0.1
      CONSTS(2) = 0
      CONSTS(3) = 0
      CONSTS(4) = 1e-3
      CONSTS(5) = 0
      STATES(1) = 6
      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(21) = 2.00000
      CONSTS(13) = CONSTS(2)/CONSTS(11)
      CONSTS(14) = CONSTS(3)/CONSTS(9)
      CONSTS(15) = CONSTS(4)/CONSTS(10)
      CONSTS(16) = CONSTS(5)/CONSTS(11)
      CONSTS(17) = ( CONSTS(6)*2.00000*CONSTS(4))/(CONSTS(4)+1.00000e-06)
      CONSTS(18) = ( CONSTS(7)*2.00000*CONSTS(4))/(CONSTS(4)+1.00000e-06)
      CONSTS(19) = ( CONSTS(8)*2.00000*CONSTS(4))/(CONSTS(4)+1.00000e-06)
      CONSTS(20) = ( (1.00000+CONSTS(12))*CONSTS(15)+( (1.00000+CONSTS(15))*CONSTS(12)*CONSTS(17))/CONSTS(18))/(1.00000+ 2.00000*CONSTS(15))
      CONSTS(21) = ( CONSTS(17)*CONSTS(18))/(CONSTS(17)+CONSTS(18))
      RETURN
      END
      SUBROUTINE computeRates(VOI, CONSTS,  RATES, STATES, ALGBRC)
      REAL VOI, CONSTS(*), RATES(*), STATES(*), ALGBRC(*)
      RATES(1) = CONSTS(21)
      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) =  (1.00000+CONSTS(12)+ALGBRC(2)+CONSTS(13))*( CONSTS(17)*CONSTS(14)+ CONSTS(18)*CONSTS(15)+ CONSTS(19)*CONSTS(16))+ (1.00000+CONSTS(14)+CONSTS(15)+CONSTS(16))*( CONSTS(17)*CONSTS(12)+ CONSTS(18)*ALGBRC(2)+ CONSTS(19)*CONSTS(13))
      ALGBRC(4) =  (( CONSTS(17)*CONSTS(18))/ALGBRC(3))*( CONSTS(12)*CONSTS(15) -  CONSTS(14)*ALGBRC(2))+ (( CONSTS(17)*CONSTS(19))/ALGBRC(3))*( CONSTS(12)*CONSTS(16) -  CONSTS(14)*CONSTS(13))
      ALGBRC(5) =  (( CONSTS(17)*CONSTS(18))/ALGBRC(3))*( CONSTS(14)*ALGBRC(2) -  CONSTS(12)*CONSTS(15))+ (( CONSTS(18)*CONSTS(19))/ALGBRC(3))*( ALGBRC(2)*CONSTS(16) -  CONSTS(15)*CONSTS(13))
      ALGBRC(6) =  (( CONSTS(17)*CONSTS(19))/ALGBRC(3))*( CONSTS(14)*CONSTS(13) -  CONSTS(12)*CONSTS(16))+ (( CONSTS(18)*CONSTS(19))/ALGBRC(3))*( CONSTS(13)*CONSTS(15) -  ALGBRC(2)*CONSTS(16))
      ALGBRC(7) = ALGBRC(4)/CONSTS(21)
      ALGBRC(8) = 1.00000/ALGBRC(7)
      RETURN
      END