dset  ^ausmidx-jan.dat
undef  -99999
options little_endian
Title  Australian Monsoon Index jan
xdef 1 linear 0.0  2.5
ydef 1 linear 0.0  2.5
tdef 61 linear 00Z01Jan1948 1yr
zdef 1 levels 850
vars 1
idx  1 0  Monsoon Index using 850hPa wind data
ENDVARS