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This manual describes the present status of MOS/ARGUS, the observing procedures for using it efficiently, and an overview of the procedures to be used forARGUS data reduction.

MOS/ARGUS shares with "MOS@"the same interface with the telescope after the cassegrain bonnette, as well as most of the optical components and the operational procedures. Reading the MOS manual is then highly recommended ! Using MOS in ARGUS mode makes a bundle of fibers come at the focal plane of the telescope (MOS/OSIS mirror off), and redirect the light in a row of fibers at the same location as a MOS mask.

The CFHT detector used with MOS/OSIS is mainly "STIS2@" .

Aside from reading this manual and the MOS manual, we strongly suggest that observers also be familiar with the " Pegasus User's Manual@" Another document of potential interest is the on-line "CFHT Filter List@" Questions any of these manuals do not answer should be directed to the CFHT Directors at directors@cfht.hawaii.edu.

A copy of this document can be downloaded in compressed postscript format.