NOEMA (blue, right scale) and XMM X-ray (red, left scale) light curves of NGC 5506 obtained during the first semester of 2021. The NOEMA light curves (at 100 GHz) have a time binning of 4 min. The XMM light curves have a time binning of 17 min. The calibrator light curve is plotted in black (right scale). The calibration accuracy needed to constrain the mm variability could not be reached during the entire observation for NGC 5506 due to bad weather conditions at the NOEMA site.