Observed 3 mm fluxes of Cyg OB2 #8A, plotted as a function of orbital phase in the 21.908-day binary period. The blue symbols show the 2014 data, the red ones the 2016 data. To better show the behaviour of the light curve, the phase range is extended by 0.2 on each side. Open symbols indicate duplications in that extended range. The grey data show the 6 cm observations from Blomme et al. (2010). Note that the 3 mm flux scale (left) is different from the 6 cm one (right).