dset grd.s100
options little_endian
undef 99.9
xdef 120 linear 20.5 1.0
ydef 36 linear 35.5 1.0
zdef 1  levels 1000
tdef 37 linear 0z29dec000 10dy02hr40mn
VARS 1
s100  0 99 climat spring cereal crops 100 cm
endvars