Lomb-Scargle periodogram of the Fermi-LAT (with a time bin of one day). a) Full data set: data in the orbital phase Φ = 0.0−1.0. b) Zoom of Fig. 3a. c) Same as 3b for data with a time bin of 5 d. The false alarm probability (p) resulting from randomisation tests is indicated. A period is defined as significant for p< 1%, and as marginally significant for 1% <p< 10% (Sect. 2). d) Half the data set: data in the orbital phase Φ = 0.5−1.0. The periods P₂ and P_long here present are typical periodicities in radio data (Massi & Jaron 2013). e) Zoom of Fig. 3d. f) Same as 3e for data with a time bin of 5 d. g) Half the data set: data in the orbital phase Φ = 0.0−0.5. h) Zoom of Fig. 3g. i) Same as 3h for data with a time bin of 5 d.