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Fig. 6

image

Running periodogram produced as described in Sect. 5.2. Each 15 d periodogram was normalized to match significance levels thus to be directly comparable to the others. Following the normalization the significance level is at 1. The color scale is logarithmic (i.e., the whole intensity range encompasses 5 orders of magnitude) to make the weak coherent signal at 0.158 d roughly visible.

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