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WHT UES (Figure 2)

The limits on the search area are set by the autoguider probe x and y travel, vignetting by the derotation optics and the shape of the central aperture in the autoguider mirror. The coarse and fine probes are mounted on the same xy stage and therefore have the same limits, but different zero-points. Figure 2 is for the coarse probe. These configurations have not been tested and their parameters may be incorrect.