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If no offset guide stars are available, and the object being observed is bright enough to be visible on the slit using the slitviewing probe, then it is possible to autoguide on this image. The procedure is very similar to that described above for offset guiding. It is made difficult in practice by the small field of view available.
The detailed procedure is as follows. Commands with the ICL prompt are issued from the system computer, and commands with the TCS prompt are issued from the Telescope Control System.
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