Apoastron peak. Fermi-LAT gamma-ray data folded with the orbital periodicity for three consecutive Θ-intervals. a)Θ = 7.12−7.22 (MJD 55 235−55 402); b) Θ = 7.22−7.32 (MJD 55 402−55 569); c) Θ = 7.32−7.42 (MJD 55 569−55 740). d) GBI radio data at 8 GHz folded with orbital period . The two Θ-intervals are those considered in Fig. 1 and in this figure for Fermi-LAT data. The orbital phase of the peak of the two radio curves agrees well with those of the second peak in GeV curves.