C
C There are a total of 3 entries in the algebraic variable array.
C There are a total of 3 entries in each of the rate and state variable arrays.
C There are a total of 11 entries in the constant variable array.
C
C
C VOI is time in component environment (hour).
C STATES(1) is PRL in component PRL (nanog_ml).
C CONSTS(1) is kD in component PRL (nanog_ml).
C CONSTS(2) is kO in component PRL (picog_ml).
C CONSTS(3) is rP in component PRL (nanog_ml_hr).
C CONSTS(4) is qP in component PRL (first_order_rate_constant).
C STATES(2) is OT in component OT (picog_ml).
C STATES(3) is DA in component DA (nanog_ml).
C ALGBRC(1) is vD in component DA (nanog_ml_hr).
C CONSTS(5) is vDbar in component DA (nanog_ml_hr).
C CONSTS(6) is DA_infinity in component DA (nanog_ml).
C CONSTS(7) is qD in component DA (first_order_rate_constant).
C CONSTS(8) is kx in component OT (picog_ml).
C ALGBRC(2) is vO in component OT (picog_ml_hr).
C CONSTS(9) is vObar in component OT (picog_ml_hr).
C CONSTS(10) is rO in component OT (picog_ml_hr).
C CONSTS(11) is qO in component OT (first_order_rate_constant).
C ALGBRC(3) is x in component x (picog_ml).
C RATES(1) is d/dt PRL in component PRL (nanog_ml).
C RATES(3) is d/dt DA in component DA (nanog_ml).
C RATES(2) is d/dt OT in component OT (picog_ml).
C
      SUBROUTINE initConsts(CONSTS, RATES, STATES)
      REAL CONSTS(*), RATES(*), STATES(*)
      STATES(1) = 20.0
      CONSTS(1) = 300.0
      CONSTS(2) = 9.0
      CONSTS(3) = 300000.0
      CONSTS(4) = 0.5
      STATES(2) = 25.0
      STATES(3) = 20000.0
      CONSTS(5) = 10000.0
      CONSTS(6) = 20000.0
      CONSTS(7) = 0.2
      CONSTS(8) = 50.0
      CONSTS(9) = 500.0
      CONSTS(10) = 1100.0
      CONSTS(11) = 1.0
      RETURN
      END
      SUBROUTINE computeRates(VOI, CONSTS,  RATES, STATES, ALGBRC)
      REAL VOI, CONSTS(*), RATES(*), STATES(*), ALGBRC(*)
      RATES(1) =  CONSTS(3)*(1.00000/(CONSTS(1)+STATES(3)))*STATES(2)/(CONSTS(2)+STATES(2)) ** 2.00000 -  CONSTS(4)*STATES(1)
      ALGBRC(1) = TERNRY(VOI.GE.2.00000.AND.VOI.LE.4.00000, CONSTS(5), 0.00000)
      RATES(3) =  CONSTS(7)*(CONSTS(6) - STATES(3)) - ALGBRC(1)
      ALGBRC(2) = TERNRY(VOI.GE.2.00000.AND.VOI.LE.4.00000, CONSTS(9), 0.00000)
      ALGBRC(3) = TERNRY(VOI.GE.2.00000.AND.VOI.LE.4.00000, 51.0000, TERNRY(VOI.GE.16.0000.AND.VOI.LE.18.0000, 51.0000, 1.00000)
      RATES(2) =  CONSTS(10)*(ALGBRC(3)/(CONSTS(8)+ALGBRC(3))) - ( CONSTS(11)*STATES(2)+ALGBRC(2))
      RETURN
      END
      SUBROUTINE computeVariables(VOI, CONSTS, RATES, STATES, ALGBRC)
      REAL VOI, CONSTS(*), RATES(*), STATES(*), ALGBRC(*)
      ALGBRC(1) = TERNRY(VOI.GE.2.00000.AND.VOI.LE.4.00000, CONSTS(5), 0.00000)
      ALGBRC(2) = TERNRY(VOI.GE.2.00000.AND.VOI.LE.4.00000, CONSTS(9), 0.00000)
      ALGBRC(3) = TERNRY(VOI.GE.2.00000.AND.VOI.LE.4.00000, 51.0000, TERNRY(VOI.GE.16.0000.AND.VOI.LE.18.0000, 51.0000, 1.00000)
      RETURN
      END
      REAL FUNCTION TERNRY(TEST, VALA, VALB)
      LOGICAL TEST
      REAL VALA, VALB
      IF (TEST) THEN
        TERNRY = VALA
      ELSE
        TERNRY = VALB
      ENDIF
      RETURN
      END