Banged my head against the fitting of polynomial terms in the WCS tweak code. I think I am doing something wrong in the interpret step, where I convert the fitting parameters back into standard WCS parameters.
Made a plan with Blanton to solve the SDSS sky level problem; ie, the determination of the large-scale sky level to very high accuracy (possible because the survey is a drift scan) for finding low surface-brightness galaxies and making pretty pictures. Sky determination is currently the single worst problem with our pretty pictures.
Those are pretty, however, can I suggest a different background color?
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