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frustrated by hdf_sd_adddata


attempting to replace a subset of existing data in an HDF SD, using idl procedure hdf_sd_adddata, receive the following error which i can not readily diagnose -
% HDF_SD_ADDDATA: Unable to write the specified HDF-SD slice.

hdf opens, sd starts /RDWR ok, sd selected ok
i have veryfied the size and order of the data variable, count and start keyword variables.

help is appreciated,

George McCabe (CUofA)
NASA / Goddard Space Flight Center / Code 693 
Building 2, Room 151 / Greenbelt, MD 20771
voice: (301)286-8283, fax: (301)286-0212