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Arc subpackage

This is a separate subpackage which can be entered by the command ARC. It provides facilities for mapping an arc image to create an arc table, and hence derive scrunch coefficients.

A BOXES list must be provided to give details of the positions of the slit locations. If an ARCL list is present, containing details of the arc-lines, it is used; otherwise one is created and modified.

Wed Mar 16 00:17:46 GMT 1994