dset ^land.mask.global.gri2.500m.lnx
options  little_endian
title land mask (land prottion %)
undef -999.0
xdef 144 linear  1.25 2.5
ydef  72 linear  -88.75 2.5
zdef 1   linear 1 1
tdef 1   linear 01jan1963 1dy
vars 1
land     1  99 the land mask from GPCC land portion data file
ENDVARS