Subject: SPIcam flat field warning

From: Russet McMillan

Submitted: Sat, 7 Oct 2000 20:36:58 -0600 (MDT)

Message number: 462 (previous: 461, next: 463 up: Index)

For once and future SPIcam users:

The dewar window on SPIcam was cleaned of some residue tonight after
the high humidity caused condensation.  The significance this has for
observers is that there has probably been a considerable change in the
flat fields for the instrument.  Flats obtained before tonight should
not be applied to data obtained after tonight.  There might also be a
meaningful change in throughput and scattered light in the center of
the image, but we can't test that tonight.

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