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Matrix masks

This is a 2D image of the pinhole mask, illuminated by the tungsten lamp in the A&G. It is used to map the variation in detector pixel size across the field, particularly important for the IPCS.

it is important to know the pixel size accurately, as any error in this parameter produces an error in the estimate of the etalon gap, and hence an error in the wavelength scale.

Thu Apr 7 00:29:52 BST 1994