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COSine

A cosine mask of 2.2 times the selected width elements, normalised to 1. 

       M(N) = COS ( (1.1 * WIDTH - N) * 2 * PI / WIDTH ) + 1.0
where N = 1.. 2.2*WIDTH.

The whole mask is normalised to 1.


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Tue Oct 7 10:18:50 BST 1997