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When analyzing 'test_extrema.m' it is obvious that 'extrema' from TISEAN and 'findpeaks' from 'signal' are * NOT * the same (apart from the fact that the data they give is presented in a different form). This is because 'findpeaks' searches for all 'peaks' (that is highs and lows) where as extrema searches for highes (default) or for lows (with option '-z').