Left panel: doppler signal for the selected pixels marked in Fig. 2h and (right panel) corresponding Scargle periodograms of the signal. (+) symbols correspond to data, solid line to a cosine fit. Dashed line represents FAP = 1%, dotted line represents FAP = 5%. On the left panels, the P value gives the period of the fitted cosine curve in minutes. The error bar is equal ±0.5 km s−1.
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