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Some sort of NULL value in IDL ?



Hi,

Is there something like a NULL value available in IDL ? I have some data
which I have to export as a HDF file.  But not all of my data is good,
so I want to export the bad points as NULL values like in a database.
Maybe this has more to do with the HDF format than with IDL itself, but
maybe someone has encountered this problem before.

Thanks,

Henk


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