dset ^ismidx.1976.day.dat undef -9.96921e+36 options little_endian Title ismidx = U850 (5-15N,40-80E) - U850 (20-30N,60-90E) xdef 1 linear 0.0 2.5 ydef 1 linear 0.0 2.5 tdef 366 linear 00Z01Jan1976 1dy zdef 1 levels 850 vars 1 idx 1 0 Monsoon Index using 850hPa wind data ENDVARS