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Hi Lee, The error code -57 is associated with the error message Start+count exceeds dimension bound and probably means there is something wrong with the start or count vectors that are supplied as arguments to nf90_get_var. It has nothing to do with the amount of space allocated to receive the data, because the netCDF library has no way of determining how much space you have allocated. It just assumes there is enough space. The error message means that if you add start(i)-1 and count(i), the result exceeds the length of the ith dimension of the variable, where the first dimension of the variable is associated with start(1) and count(1). So, for example, if you have a netCDF variable for which the CDL declaration from ncdump is dimensions: lat = 20; lon = 30; variables: float var(lat,lon); // lon varies fastest, CDL uses row-major The corresponding Fortran declaration for reading 3 latitide bands will be something like real varslice(30, 3) and to read latitude bands 18, 19, and 20 you could use something like integer start(2), count(2) count = (/ 30, 3 /) start = (/ 1, 18 /) nf90_get_var(ncid, varid, varslice, start = start, & count = count) This would get an error like you are getting if start(1)-1 + count(1) is greater than 30 or if start(2)-1 + count(2) is greater than 20. Complete examples of writing and reading 4D slices are in: http://www.unidata.ucar.edu/software/netcdf/examples/programs/pres_temp_4D_wr.f90 http://www.unidata.ucar.edu/software/netcdf/examples/programs/pres_temp_4D_rd.f90 --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: XBL-623715 Department: Support netCDF Priority: Normal Status: Closed