GLS periodograms oſ SONG RVs (blue) and Hα activity indicator (red) of HD 203030: (a) SONG RVs, (b) SONG RVs after fitting sinusoid with P = 2.23 days, (c) SONG Hα indicator. Vertical orange lines represent the star’s rotation period and its 1-day alias, and green lines represent the planetary candidate of the rotation period with its 1-day alias. Horizontal dashed lines show the theoretical FAP levels of 10%, 1% and 0.1% for each panel.