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mkdocs/docs/design.md

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+## Detector Flags
+
+Detector data can be "flagged" or cut for a variety of reasons. Sometimes a flag
+indicates that the data is corrupted in some way and should not be used. In
+other cases, flags are used to classify data with particular properties. For
+example, samples crossing a planet or while the telescope is in a turnaround.
+TOAST supports flags that can be applied for an entire detector within an
+observation, and also flags for individual detector samples.
+