Re: isis flux_corr question

Roy Kilgard <rkilgard_at_email.domain.hidden>I have what may be a simple question but this has been bugging me
>for a while.  I'm trying to compute exposure corrected counts for
>an energy range of a spectrum, say 1-2 keV (~12.4-6.2 A).

I think you mean photon flux in a region.  If so, region_counts is not
what you want to use since that operates on counts and not flux.  Try
region_flux instead.  

Also, the _A function is useful for converting energy <--> angstroms.
For example instead of

>variable e1=12.39854;
>variable e2=6.19927;
[...]
>variable b1=region_counts(data_id,e2,e1);  

you can use:

    variable lam1, lam2, b1;
    (lam1, lam2) = _A(1,2);
    b1 = region_flux (data_id, lam1, lam2);

Or, more simply as:

    b1 = region_flux (data_id, _A(1,2));

Good luck,
--John

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