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Multiple SDFITS tables in a single file

Any number of FITS binary tables can be attached to the same FITS table. This convention doesn't have anything to say about how the tables in such a file might be related. This strategy, attaching multiple SDFITS binary tables to a single FITS file, is one possible strategy for storing variable length DATA. DATA with similar sizes could be stored in separate tables, minimizing the amount of padding required in any one table without resorting to using the table heap convention to store variable length arrays. SDFITS readers should be capable of appending the contents of several SDFITS tables to a single result.
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