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(a) Noisy EPSP and its mean simulated as 
, with 
, 
and 
. (b, d) Legendre spectra of the noisy EPSP (b), and its mean (d). (c) Inverse transform of 
through 
of b approximating the EPSP's mean (dashed, red). Gray curve in c, Fourier lowpass (
) of the noisy EPSP.
