<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt">hello all,<br><br>please i am working with ncep data. the data is available in .nc format and for each year starting from 1979 to 2011as isolated files and this is the ctl inf<br><br>dset F:\hgt.1979.nc<br>title daily NCEP/DOE Reanalysis 2<br>undef -9.99e+33<br>dtype netcdf<br>xdef 144 linear 0 2.5<br>ydef 73 linear -90 2.5<br>zdef 17 levels 1000 925 850 700 600 500 400 300<br> 250 200 150 100 70 50 30 20 10<br>tdef 365 linear 00Z01JAN1979 1440mn<br>vars 1<br>hgt=>hgt 17 t,z,y,x Daily Geopotential Heights on Pressure Levels<br>endvars<br><br>how do i change the .ctl to read the data as a file.<br><br>ugo okoro<br>cmsr, iap-cas<br>beijing.<br></div></body></html>