general comments to SSAP and SDM from outside

[Doug Tody]

On Sun, 26 Aug 2007, Jonathan McDowell wrote:

> Given these two spectra, the user can reconstruct the full spectrum by
> multiplying them together. (I don't think we are ready to add metadata to
> explicitly connect them yet.) You say "the second spectrum is... fit not
> data, so it is probably not correct.." - but a spectrum generated from
> a fit is perfectly acceptable, we make no restriction that the VO Spectrum
> has to be directly observed data.

One could possibly also use the background model element to hold the
normalization function.  It is much the same thing, just that the
relationship is a divide instead of a subtract.

	- Doug