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GAUsian

A gaussian mask. The user selects the width of the mask which is the standard deviation of the gaussian (i.e. 1 sigma) and the length of the mask, which is the total length of the mask.

       M(N) = EXP (- (LMASK/2 - N)**2 / (2 * WIDTH**2))

where N = 1..LMASK, WIDTH=1 SIGMA, LMASK is the total mask length.

The whole mask is normalised to 1.

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