[fitsbits] Primary & Alternate WCS Keyword Order

Mark Calabretta mark at calabretta.id.au
Sun Jul 1 11:47:31 EDT 2012


On Sat 2012/06/30 11:52:55 -0400, Phil Hodge wrote
in a message to: <fitsbits at nrao.edu>

>>    WCSAXESa -- [integer; default: NAXIS or largest of WCS indexes i or j
>>    for representation 'a']
>>    Number of coordinate elements in WCS description 'a'.  This keyword,
>>    if present,_should_  precede all keywords for WCS description 'a',
>>    except NAXIS.  Note that the value of WCSAXESa_may_  exceed the number
>>    of pixel axes for the HDU, and that the default value of WCSAXESa may
>>    differ for differing 'a'.
>
>Did you mean that the value of WCSAXESa may differ for differing 'a', or 
>just that the default value may differ?

Both.  If the WCSAXESa can differ from NAXIS then there's no reason to
expect them not to differ from each other.

Regards, Mark





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