[fitsbits] frequency definitions

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On Mon, 4 May 2009, Tom Kuiper wrote:

> I'd like to get it clear in my mind what the various frequency 
> definitions are.  Is the following right? If there is a place where 
> all this is clearly laid ou, please refer me to that.

Not a spectral WCS expert, but the standard and official references
are :

- http://fits.gsfc.nasa.gov/fits_standard.html
   the latest release of the FITS standard, in particular chapter 8

- the full WCS paper III, either as published or
   http://www.atnf.csiro.au/people/mcalabre/WCS/scs.pdf

   (the other WCS papers are all listed in
   http://www.atnf.csiro.au/people/mcalabre/WCS/index.html

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