Activity index periodograms for the star HD 220197. Two top panels: periodograms for the radial velocity data and post-fit residuals; the most significant period value and power are shown in the upper right corner, while the horizontal lines indicate the FAP levels of 10% (solid red), 1% (dashed orange), and 0.1%(dotted green). Following lower panels: periodograms for the bisector inverse span, FWHM, , ΔV, and V_asy(mod) with Spearman correlation rank r and significance p with radial velocity data shown in each panel. The most significant periods for radial velocity data and residuals are highlighted in all panels as a red and green vertical dotted line, respectively, while the stellar rotation period is indicated by a blue vertical dotted line.