Probability multiplied by number of trials (Ntrials = 10 000) against χ2 for simulated single and broken power-law models. The solid black curve points out expected probability of a perfect model. The best fit by a single power law is obtained with a slope = –1.3. Broken power laws with the low-frequency slope = –0.5, the high-frequency slope between –1.1 and –1.3, and with broken frequency = 0.001 Hz provide a slightly better description of the observed power spectrum.
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