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 | Messier 31 from the 3pi stacks showing an extreme example of the over-subtraction of the background. |
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(2) issues with the row-by-row bias and continuity corrections - these are applied and therefore seen on individual ccd scales (~600 pixels). As this is done at the detrending stage this is currently very difficult to correct. There is an aspiration to re-analyse all bright galaxies but this has not yet been done.
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