Peter,
> > Flux depends on azimuth? Not heard of this one. Are you referring to the
> > change in pixel size across an image caused by the projection? This is an
> > issue which I'd like to shelve until we have a bit more experience in the
> > spectral case.
>
> Sorry should have been clearer, I actually meant airmass, certainly the
> most significant flux change if you're interested in photometry.
Ah, you must have meant "elevation" rather than "azimuth"!
David
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