[fitsbits] Maximum number of extensions

[Richard West]

Hi,

Perhaps a daft question, but not one I've found an answer too in any of the
FITS documentation I've looked in. Is there a formal limit to the number of
extensions (HDUs) in a FITS file?

CFITSIO seems to be quite happy creating and manipulating files with large
numbers of extensions (ie. tens of thousands), though FTOOLs doesn't like
any file with more than 1000.

So I'm wondering if this is an artificial limit imposed by FTOOLs, or
CFITSIO being (over-)flexible.

Thanks,

Richard.