Light curves of NOEMA (top, blue line) and NuSTAR (bottom, red line) with time bins of 60 and 6 sec., respectively. The 1.2h gap in the middle of the NOEMA light curve corresponds to the source transit at a high local elevation where it became impossible to track. The gaps in the NuSTAR light curve correspond to Earth occultation and SAA passages. The gray areas correspond to the time ranges where both NOEMA and NuSTAR data were acquired simultaneously. The black points in each panel correspond to the weighted mean of each light curve in these different time ranges, which are reported in Fig. 2