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The search area is a rectangle in the unvignetted field and the guide probe cannot obscure the CCD Camera. The only conditions on x and y are therefore:

xmin < x < xmax

ymin < x < ymax

Vignetting sets the value of rmax. Note that the aperture offset to the centre of the detector depends on the chip and is large.

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Mon Mar 1 17:52:09 GMT 1999