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There is a limit of % on the quality of the aperture photometry possible with the undersampled data expected for 2MASS. Good telescope control, jitter per frame, is required to ensure appropriate sub-pixel sampling. The effect of completely dead pixels can be ameliorated by an algorithm such as KAMPHOT that uses the knowledge of dead pixels available in the individual frames.

Gaylin Laughlin
Tue Feb 14 09:01:41 PST 1995