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INT Prime CCD (Figure 3)

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:

displaymath482

displaymath483

Vignetting sets the value of tex2html_wrap_inline486 . Note that the aperture offset to the centre of the detector depends on the chip and is large.



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Wed Sep 17 15:19:48 BST 1997