Left panel: maximum power of the most significant peak of the periodogram as derived for 20 time series that were stretched for different Ṗ/P values for the Chandra observation performed in Nov. 2014. Right panel: periodogram for the most significant detection with Ṗ/P = −8.84 × 10−8 s−1. Horizontal lines correspond to the 32%, 10% and 1% false alarm probability.
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