[fitsbits] CDELTn

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On Tue, 18 Sep 2007, David Berry wrote:

> Section 2.1.2 of FITS-WCS paper 1 says "Furthermore, all CDELTi must
> be non-zero." 

And the WCS paper is "incorporated by reference" in the draft FITS 
standard 3.0. So it looks like Francois has spotted something which is 
best to spell out clearly and explicitly also in the standard (and we in 
the technical panel have missed).

... oh, wait a moment ... if this wasn't stated before WCS came out, 
FITS file created before then would be exempt from the "new" 
requirement, wont't they ?  How do these go together ?

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