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Observing Strategies

The observing strategies for target fields depend on whether or not dithered exposures can be used to measure the sky brightness. For relatively blank fields, observations obtained with small, dithered offsets can be combined with some outlier rejection algoritm to obtain a reasonable measurement of the sky background during the observations. If the field is quite crowded, or the target is extended over a significant fraction of the detector area, then it is necessary to offset to a nearby region of blank sky to obtain a useful sky measurement. Here we summarize successful strategies for these two observing modes.

Relatively Blank Fields

Crowded Fields and Extended Sources

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