BIS variations of Polaris measured from Hermes spectra phase-folded using three periods determined from Lomb-Scargle periodograms. Each panel shows the BIS variations associated with the periods indicated at the top (Δv_BIS). The signals at P_60d = 60.16582 d, P_puls = 3.97139 d, and P_40d = 40.22074 d were identified using a successive pre-whitening procedure in this order. Second-order Fourier series models were fitted to the data using all three periods simultaneously and are shown separately for each signal as a solid red line. P_60d and P_40d are unlikely to be independent frequencies, since P_40d/P_60d = 0.6685 is suspiciously close to 2/3 while there remain phase gaps in the sampling of the 60 d signal. The signal at 40.2 d had previously been identified in bisector variations by HC00. We notice that the 40 d and 4 d signals have similar amplitude. The grayscale color coding traces observing date (white to black).