Upper panel: summed up logarithmic powers of the periodograms of the individual segments from Fig. 4. The solid blue curve shows a fourth order polynomial fit. Lower panel: exponential power of the upper panel with the polynomial fit subtracted. Peaks above the arbitrarily chosen significance limit of 0.5 h1 (dashed red line) are considered as significant, and used as a measure of DR in the following. In this picture the harmonics (P1/ 2 and P1/ 3) are also more pronounced.
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