***output grads ctl file for imt_cf***
dset ^cnst.dat
title constatnt data
OPTIONS big_endian sequential 
undef -999.9
xdef  550 linear 1 1
ydef  755 linear 1 1
zdef    1 linear 1 1
tdef    1 linear 00:00z20JUL1950 1mn
vars 11
ZS     1 99 topography
SL     1 99 land/sea ratio
FLAT   1 99 latitude
FLON   1 99 longitude
KIND   1 99 land surface
ROUGH  1 99 roughness
WET    1 99 wet
ALBED  1 99 albedo
FKTG   1 99 FKTG (please contact the corresponding author)
ROCTG  1 99 ROCTG (please contact the corresponding author)
URBAN  1 99 urban ratio
endvars
***end of ctl file***