(a) Zoomed-in view of the light curves from Fig. 1 during the high-cadence observations (MJD 60045-60739). (b) Time series of the integrated emission at a velocity lower than 18.8 km s⁻¹ (squares) and higher than 25.1 km s⁻¹ (circles) folded modulo 70.1 d. The filled symbols represent data binned with a 0.1 phase increment. The bars denote the standard deviation. The gray arrows mark the phase of EVN (Bartkiewicz et al. 2009), VLA-C (Hu et al. 2016), VLA-D (Nguyen et al. 2022) and ALMA observations.