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WHT CASS

The travel of the autoguider probe defines a semi-annulus (see above). Note, however, that the probe can obstruct the slit-viewing optics (not the slit itself) for θ< 30000, giving an additional azimuth restriction. The excluded inner region (a circle) is treated as a special case of the ellipse mentioned earlier, with l = m.



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Mon Mar 1 17:52:09 GMT 1999