dset ^wnpmidx.1992.day.dat undef -9.96921e+36 options little_endian Title wnpmidx = U850 (5-15N,100-130E)- U850 (20-30N,110-140E) xdef 1 linear 0.0 2.5 ydef 1 linear 0.0 2.5 tdef 366 linear 00Z01Jan1992 1dy zdef 1 levels 850 vars 1 idx 1 0 Monsoon Index using 850hPa wind data ENDVARS