dset grd.sr
options little_endian
undef 99.9
xdef 100 linear 20.5 1.0
ydef 21 linear 40.5 1.0
zdef 1  levels 1000
tdef 73 linear 0z29dec1986 10dy03hr00mn
VARS 1
sr  0 99 ratio 20/100 spring cereal crops
endvars