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Geometric distortion

The IPCS suffers from a variety of image distortions (e.g. S-distortion, barrel distortion). The worst of these are removed online. However, the distortion gets worse towards the edge of the detector. If data at the edge of the detector is crucial to an observation, the image distortion should be calibrated out using observations of a ``comb'' dekker.

Tue Aug 15 16:42:46 BST 1995