c     ------------------------------------------------------------------
c     file 'c1db4.inc'
c
c     This common block contains variables representing the crop
c     database properties for each subregion.  These variables
c     are used to estimate crop geometric properties.
c
c     Parameter include files:  p1werm.inc
c
c     + + + VARIABLE DECLARATIONS + + +
c
      real             ac0hta(mnsub)
      real             ac0htb(mnsub)
      real             ac0lza(mnsub)
      real             ac0lzb(mnsub)
      real             ac0saa(mnsub)
      real             ac0sab(mnsub)
      real             ac0lia(mnsub)
      real             ac0lib(mnsub)
      real             ac0cca(mnsub)
      real             ac0ccb(mnsub)
c
      common / c1db4 /
     r                 ac0hta, ac0htb, ac0lza, ac0lzb, ac0saa, ac0sab,
     r                 ac0lia, ac0lib, ac0cca, ac0ccb
c
c     + + + VARIABLE DEFINITIONS + + +
c
c     ac0hta - Height "a" for LAIZ/SAIZ/LAI/canopy estimation (?)
c
c              range values      min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------
c
c            - This variable is a height parameter coefficient for
c              estimating LAIZ/SAIZ/LAI/canopy for each of the
c              subregions.
c
c
c     ac0htb - Height "b" for LAIZ/SAIZ/LAI/canopy estimation (?)
c
c              range values      min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------
c
c            - This variable is a height parameter coefficient for
c              estimating LAIZ/SAIZ/LAI/canopy for each of the
c              subregions.
c
c     ac0lza - Leaf area "a" for LAIZ estimation (?)
c
c              range values      min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------
c
c            - This variable is a leaf area parameter coefficient
c              for estimating LAIZ for each of the subregions.
c
c     ac0lzb - Leaf area "b" for LAIZ estimation (?)
c
c              range values      min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------
c
c            - This variable is a leaf area parameter coefficient
c              for estimating LAIZ for each of the subregions.
c
c     ac0saa - Stem area "a" for SAIZ estimation (?)
c
c              range values      min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------
c
c            - This variable is a stem area parameter coefficient
c              for estimating SAIZ for each of the subregions.
c
c     ac0sab - Stem area "b" for SAIZ estimation (?)
c
c              range values      min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------
c
c            - This variable is a stem area parameter coefficient
c              for estimating SAIZ for each of the subregions.
c
c     ac0lia - Leaf area index "a" for LAI estimation (?)
c
c              range values      min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------
c
c            - This variable is a leaf area index parameter coefficient
c              for estimating LAI for each of the subregions.
c
c     ac0lib - Leaf area index "b" for LAI estimation (?)
c
c              range values      min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------
c
c            - This variable is a leaf area index parameter coefficient
c              for estimating LAI for each of the subregions.
c
c     ac0cca - Canopy cover "a" for canopy cover estimation (?)
c
c              range values      min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------
c
c            - This variable is a canopy cover parameter coefficient
c              for estimating crop canopy cover for each of the
c              subregions.
c
c     ac0ccb - Canopy cover "b" for canopy cover estimation (?)
c
c              range values      min        max
c              ------------   ---------  ---------
c              fixed          fmin       fmax
c              typical        tmin       tmax
c              ------------   ---------  ---------
c
c            - This variable is a canopy cover parameter coefficient
c              for estimating crop canopy cover for each of the
c              subregions.
c
c     ------------------------------------------------------------------