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The parallelism of most etalons with the CS-100 controller is, in
general, fairly stable. Nevertheless, it is a good idea to
periodically measure the width of one of the rings in the calibration
lamp frames, or one of the night sky rings in the data frames. Any
substantial broadening of a specific ring should be carefully
investigated. The ringcheck script is useful for measuring the
width of rings.
Patrick Shopbell
4/23/2001