HD 55693 periodogram for TERRA1 data. Descending, RVs, S-Index, FWHM, BIS, and window function. FAP lines included for 10%, 1%, and 0.1%, in dashed red, dotted purple, and dotted blue, respectively. Circle markers show the five periods with the greatest power, coloured by FAP region. The orange coloured region corresponds to P_rot = 27.4 ± 3.2 and the green one to $P_{\text{mag}}={2403}_{-218}^{266}$.