Subject: Crab spectrum with different gain

Hello Peter,

Thanks for your plots. Here is a result of my analyses of the
> 3 deg offaxis pointings in revolution 239. The figure shows
the fitted photon index as a function of an azimuth angle which
is defined as the centroide angle of the Crab counts on the detector
measured from 'the x-axis' in normal shadowgram plots and counter-clock wise.
This means that high gain is found around azimuth 210 deg (e.g. SWID
023900890010) and low gain around 30 deg (e.g. SWID 023900970010)
This agrees quite well with your figure 'compare_jmx1_onaxis' except
that I have photon indices generally lower than the on-axis value
(presumably 2.1, but I have to look again).

Regards

Niels Jørgen
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Niels J. Westergaard
Danish National Space Center
Juliane Maries Vej 30, DK 2100 Copenhagen O
Phone: +45 35325705; FAX:  +45 35362475