Re: Integral in xspec

Joseph E. Meier (jem@sonic.bruker.com)
Thu, 4 May 1995 08:58:24 -0400

On May 3, 2:26pm, Vikram Varma wrote:
> Subject: Integrals in xspec
>
> Has anyone been using Xspec out there? I wanted to
> integrate a series of spectra, but after scanning through
> the manual, I have been unable to find a parameter that
> would let an absolute scale be defined for either the
> integrals or the peak intensities.
>
> It may be possible to use pscale= noise for the peak intensities,
> but the integrals are another story.
> It seems impossible, so I must be missing something.
>

Xspec always operates in absolute intensity mode. That is, all calculations
are done in double precession, and so no parameter is needed to set it into an
absolute scale. To see the absolute values, you just need to change the
"yaxis" to absolute intensitiey via the "units" command. So, the integral
values are always calculated in absolute value mode and so are the peak
intensities. If you execute the "report" command the values are given in both
normalized and absolute values.

Sincerley,

Joe

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