The peak height ratio (PHR) hk/hk + 1 versus peak number k of the periodogram from Fig. 2. The solid red line shows the median PHR, and the dashed red lines mark the ± 1σ levels. At k = 3 the deviation from the median is at maximum, meaning that three significant peaks were found by this method. These are marked by red asterisks in Fig. 2.
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