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Preface to the Second Edition

The Second Edition of the Guide is designed to replace the First Edition (October, 1973) and its revision (March 1, 1974). In addition, more information is included to cover areas of operation and data reduction not yet well understood at the time of the earlier publications. Specifically, the additions include discussions of the absolute pointing capability and observations of close binary systems; of a recently-implemented backup guidance unit, which extends the guidance limit by one magnitude; and of a high time-resolution mode which can be used to increase the signal to noise attainable with tubes V1 and V2 (near UV). Amplified discussions are included on the partial backgrounds, stray light corrections, use of the command generation program; and general policies of the Princeton Guest Investigator Program.