SMEIlight curve of 28 Cyg after subtraction of the instrumental annual variation shown in Fig. 4 and after elimination of data from annual phases with elevated noise. In addition, some extreme outliers are clipped in this figure. No indication is visible of any photometric equivalent of the fading of the Hα emission between 2005/2007 and 2013 (Sect. 3.3). Overplotted in blue is a fitted sine curve with frequency 0.00471 c/d.