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The limits on the search area are set by the autoguider probe x and y travel and vignetting by the derotation optics. They should also be affected by the shape of the central aperture in the autoguider mirror, for which there are several alternatives. Since this is not in focus, partial vignetting of the guide star occurs, and the effects are complicated. For the moment, no correction is implemented.

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Mon Mar 1 17:52:09 GMT 1999