Time series (left column) and GLS periodograms (right column) of the RV measurements and CCF profile variation diagnostics, as extracted from the HARPS spectra of TOI-282. On the left, the red curves in the second, fourth, and fifth panels represent the linear and quadratic trends, and the sine function, as derived from the best fit to the highest peak detected in the corresponding GLS periodogram. On the right, the horizontal dotted red lines mark the 0.1% false alarm probability (FAP). The shaded areas in yellow, orange, and red mark the rotation frequency f_rot, and its first and second harmonics (2f_rot and 3f_rot), along with their 1σ confidence intervals. The transit frequencies f_b, f_c, and f_d of the three planets are marked with vertical blue dotted lines.