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Observing with Longslits

There are two kinds of longslits which you might consider: (1) the metal slit (1.5 arcsec), which is quite dirty and hence of uneven width; and (2) the photographic film slits. For the latter, several are left with the COSMIC black carrying pouches; you should see the section on mounting/installing slitmasks in §6.

This section assumes that the slits are already installed in COSMIC.


Roy Gal