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It turns out that this is because of the way that ncdump reads variables. If the variable is below some size, it just asks for the whole variable. If the variable is over some limit, then is asks for the variable piece by piece. So in this case, the small variable is asked for with no constraint and the larger variable is retrieved in pieces using constraints. =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: TMR-458993 Department: Support netCDF Priority: Urgent Status: Closed