grib data vs netcdf data

Respected Sir/Mam,

      I am sending you 2 scripts for plotting of temperature over part of
south pole from grib data and again through netcdf data. My grib plot is
coming right but the netcdf is not showing any contour. but if i comment
the following 4 lines, it plots but then both plots doesn't match with
each other.
  tc2!0 = "xlat"
  tc2!1 = "xlon"
  tc2&xlat = xlat
  tc2&xlon = xlon

                                   thanking you sir/mam
                                            Sourin Saha

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