If I plot your test data up, there is a wave with a period of something like 3000, and there is a wave with a period of about 60. Is it the long period you are looking for extrema in?

In reply to Re^2: Finding local maxima/minima in noisy, pediodic data by Anonymous Monk
in thread Finding local maxima/minima in noisy, pediodic data by kikuchiyo

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