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2D spectrum integral fingerprinting utility. Breaks the spectrum down into bins of user-specified size and returns the integrals over those bins. Syntax:



     spectrum    - the matrix of a real or complex 2D spectrum
        nbins    - a vector with two integers, specifying the
                   number of bins in each spectral dimension

Note: spectrum matrix dimensions must be divisible by the corres- ponding element of nbins vector.