Periodograms of rapid optical intensity variations in outburst No. 7 in GK Per (the intranight CCD data series marked in Fig. 3g). a), c), e), g), i), k), m), o) Series of data from a given night (the dates in the form of JD–2 400 000 are given). Each data set was investigated with the Lomb-Scargle method (b), d), f), h), j), l), n), p)). See Sect. 3 for details.
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