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Cosmetic effects and fringing

The thinned RCA chip, and to a lesser extent the thinned Tektronix chips, suffer from fringing at red wavelengths. It is possible to remove the fringing by subtracting a ``fringe map'', which is a deep exposure of a blank area of sky. Currently the RCA chip is not recommended under any circumstances.

Tue Aug 15 16:42:46 BST 1995