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Finally, the condition of the telescope optics should be stored in a
character descriptor named
in the instrumental ``.tbl'' file.
Possible values are
if the mirrors have been re-coated or cleaned
within two weeks of the observing run, and/or a flashlight beam is barely
visible on optical surfaces;
if a flashlight beam is plainly visible on the optical surface, but the
dirt is not very bad; and
if shining a flashlight beam on the primary produces a sensation of
revulsion in a trained observer.
Obviously, some experience is required to judge these categories accurately.