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[fitsbits] CDELTn
Francois,
I just found a curiosity: FITS files having CDELTn axis set to zero. This may look strange, but when the corresponding NAXISn is 1, this should be harmless. Is the value zero actually forbidden in the FITS definition ? (I did not find this restriction in the FITS definition). Regardless of the value of NAXISn, computing the coordinate value at a pixel would involve dividing by CDELTn. For example: CRVALn + (1 - CRPIXn) / CDELTn. So it's not as harmless as it may seem. Phil |
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