Example of transform coefficients when two patterns A and B are embedded in interference. The basis vectors used to compute the transform coefficients were derived from all 216 recordings summed to form a mean signal. (A) The spectrum of the mean signal from 216 individual recordings. (B) The spectrum of the mean signal z (black) and the sum of transform coefficients from pattern A + pattern B (red) are identical and overlapped. (C) Transform coefficients for a nonpattern, which is uncorrelated to either pattern A or pattern B. (D) Transform coefficients for another nonpattern, which is also uncorrelated to either pattern A or pattern B.