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Old 12-12-2011, 03:18 PM
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leinad (Dan)
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Join Date: Feb 2008
Location: Perth, WA
Posts: 1,307
Are you asking why the increase of the maximum of the FWHM with overexposure?
You could try this one.

Detecting and measuring faint point sources with a CCD
"Herbert Raab"
http://www.astrometrica.at/papers/PointSources.pdf
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