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ESO - Why do the flats in my data have different exposure times and how do I know which ones to use?

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Data Reduction Frequently Asked Questions

Why do the flats in my data have different exposure times and how do I know which ones to use?

The exposure times of the flat fields depends on slit width and readout mode. Reflex will organize them appropriately, so that for each recipe the flat fulfilling the respective constraints is associated.