Multiple models revisited

Hi

I'd like to modify the "constant" kernel so that it is a "constant +
bremsstrahlung" kernel. (I think this is easier in the short term
than changing ISIS so that independent models can be fit to each data
set). Looking at the code for the constant kernel, I think there are
only two things I need to know: (1) how do I declare an array or
structure to hold a "spectrum", and (2) how do I call _brems (or
whatever) to put the appropriate spectrum into that array or
structure? I can then just change g->val[i] *= (*par) * (k->eff_area
[n] * k->exposure_time); to something along the lines of  g->val[i] =
( g->val[i]*(*par) + brems_spec->val[i] ) * (k->eff_area[n] *
k->exposure_time); Um... I'm not sure how straightforward this is? I
believe that with this modification ISIS will do absolutely
everything I want!!

Thanks again for your help with bug fixes and adding new features...

Cheers
Andy
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