Lomb periodograms of the RA and Dec coordinates of the spin axis displayed in Fig. 2. A significant peak (with a significance higher than 99.99%) is located at a periodicity of approximately 270 h.This result is fully compatible with those found by Jorda et al. (2016) with the PDM technique. Data phased to this periodicity are shown in Fig. 12 of Jorda et al. (2016).