!     ------------------------------------------------------------------
!     file 'c1db2.inc'

!     This common block contains variables representing the acop
!     database properties for each subregion.

!     Parameter include files:  p1werm.inc

!     + + + VARIABLE DECLARATIONS + + +

      real             actopt(mnsub)
      real             actmin(mnsub)
      real             acfdla(mnsub)
      real             acrdla(mnsub)
      real             ac0caf(mnsub)
      real             ac0psf(mnsub)
!      real             ac0alt(mnsub)   !Why has this one been removed?
      real             ac0pt1(2,mnsub)
      real             ac0pt2(2,mnsub)
      real             ac0fd1(2,mnsub)
      real             ac0fd2(2,mnsub)
      real             ac0ck(mnsub)

      common / c1db2 /                                                  &
     &                 actopt, actmin, acfdla, acrdla,                  &
     &                 ac0caf, ac0psf,                                  &
     &                 ac0pt1, ac0pt2, ac0fd1, ac0fd2, ac0ck

!     + + + VARIABLE DEFINITIONS + + +

!     actopt - Optimal temperature for plant growth (deg C)

!              range values      min        max
!              ------------   ---------  ---------
!              fixed          fmin       fmax
!              typical        tmin       tmax
!              ------------   ---------  ---------

!            - This variable contains the optimal temperature for
!              plant growth for each of the subregions.

!     actmin - Minimum temperature for plant growth (deg C)

!              range values      min        max
!              ------------   ---------  ---------
!              fixed          fmin       fmax
!              typical        tmin       tmax
!              ------------   ---------  ---------

!            - This variable contains the minimum temperature for
!              plant growth for each of the subregions.

!     acfdla - Fraction of growing season when LAI starts declining (?)

!              range values      min        max
!              ------------   ---------  ---------
!              fixed          fmin       fmax
!              typical        tmin       tmax
!              ------------   ---------  ---------
!
!            - This variable contains the fraction of growing
!              season value when LAI begins declining for a crop
!              in each subregion.
!
!     acrdla - LAI decline rate (?)
!
!              range values      min        max
!              ------------   ---------  ---------
!              fixed          fmin       fmax
!              typical        tmin       tmax
!              ------------   ---------  ---------
!
!            - This variable contains the LAI decline rate for a
!              crop in each subregion.
!
!     ac0caf - Critical aeration factor (?)
!
!              range values      min        max
!              ------------   ---------  ---------
!              fixed          fmin       fmax
!              typical        tmin       tmax
!              ------------   ---------  ---------
!
!            - This variable contains the crop critical aeration
!              factor for each of the subregions.
!
!     ac0psf - Pest stress factor (?)
!
!              range values      min        max
!              ------------   ---------  ---------
!              fixed          fmin       fmax
!              typical        tmin       tmax
!              ------------   ---------  ---------
!
!            - This variable contains the crop pest stress
!              factor for each of the subregions.
!
!     ac0alt - Aluminum tolerance index (?)
!
!              range values      min        max
!              ------------   ---------  ---------
!              fixed          fmin       fmax
!              typical        tmin       tmax
!              ------------   ---------  ---------
!
!            - This variable contains the crop aluminum tolerance
!              index for each of the subregions.
!
!     ac0pt1 - xy coordinate for 1st pt on optimal LAI curve
!
!              range values      min        max
!              ------------   ---------  ---------
!              fixed          fmin       fmax
!              typical        tmin       tmax
!              ------------   ---------  ---------
!
!            - This variable contains the (x,y) coordinate for the
!              1st point on the optimal LAI curve for the crop in
!              each subregion.
!
!     ac0pt2 - xy coordinate for 2nd pt on optimal LAI curve
!
!              range values      min        max
!              ------------   ---------  ---------
!              fixed          fmin       fmax
!              typical        tmin       tmax
!              ------------   ---------  ---------
!
!            - This variable contains the (x,y) coordinate for the
!              2nd point on the optimal LAI curve for the crop in
!              each subregion.
!
!     ac0fd1 - xy coordinate for 1st pt on frost damage curve
!
!              range values      min        max
!              ------------   ---------  ---------
!              fixed          fmin       fmax
!              typical        tmin       tmax
!              ------------   ---------  ---------
!
!            - This variable contains the (x,y) coordinate for the
!              1st point on the frost damage curve for the crop in
!              each subregion.
!
!     ac0fd2 - xy coordinate for 2nd pt on frost damage curve
!
!              range values      min        max
!              ------------   ---------  ---------
!              fixed          fmin       fmax
!              typical        tmin       tmax
!              ------------   ---------  ---------

!            - This variable contains the (x,y) coordinate for the
!              2nd point on the frost damage curve for the crop in
!              each subregion.

!     ac0ck  - extinction coefficient

!              range values      min        max
!              ------------   ---------  ---------
!              fixed          fmin       fmax
!              typical          0.0        1.0
!              ------------   ---------  ---------

!            - This variable contains the (extinction coefficient.

!     ------------------------------------------------------------------