Upper-left panel: Comparison of the temporal variability of the frequency shifts (in μHz) of KIC 11081729 extracted from the cross-correlation (Method #1, in green) and peak-fitting (Method #2, in black) analyses. Upper-right panel: Frequency shifts of the individual l = 0 (blue) and l = 1 (red) modes from Method #2. Bottom-left panel: Temporal variability of the photospheric activity proxy Sph (in ppm). Bottom-right panel: Frequency shifts extracted from Method #1 as a function of the photospheric magnetic proxy Sph. The corresponding correlation coefficient r and two-sided significance of the deviation from zero p are also indicated.
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