[fitsbits] Primary & Alternate WCS Keyword Order

[Steve Allen]

On 2012 Jun 26, at 10:00, William Pence wrote:
> Alternatively, why not just eliminate this requirement entirely, by 
> deleting this sentence: "This keyword, if present, must precede all WCS 
> keywords except NAXIS in the HDU."  What is the purpose and benefit of 
> this requirement?

I'm pretty sure I have some correspondence with Eric and Mark when
that section of WCS paper 1 was being polished, but I'd have to
go digging to see if this was mentioned.  I am hoping that Mark
will chime in on this ordering requirement.
                                                                                
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