Hi Fred,

Sorry that I've not responded sooner regarding the camera files you provided. I learned quite a bit while processing files, and needed to add some new features to my sensor analysis tool. My tool still has some difficulty in processing color image data, (white balance settings on the camera seem to produce some aberrations in my calculations). But I've now run the data for your ASI-6200MM through a new version of my tool. A screen shot of the result is attached. (But I would not rely upon this as being an accurate result yet).

One of the new features in my tool is a process that attempts to validate input files. It will produce and display histogram data of the four input files for given gain; and it will run a few analytic tests on the data. One test is intended to detect pattern noise in the images. In a few of the flat images that you provided, my tool recognized pattern noise and generated a warning. A screen shot for that is also attached.

So I reviewed the flat files in KStars fitsviewer and see that in the flat files at gain 60, 80 and 100; the center of the images have some odd speckles. In making is assessment of a sensor, my tool only analyzes a 100 x 100 pixel region at the center of the images. So these odd speckles at the center of the images may have a significant impact in the results from my tool.

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