Hi Ratna, NCL is developed, maintained, and supported by NCAR's NCL Team, so I recommend you send your question to their email list, as described here: http://www.ncl.ucar.edu/Support/index.shtml --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: ZVW-166214 Department: Support netCDF Priority: Normal Status: Closed