Rotational modulation of fluxes of C II doublet, Si III line, N V doublet, and combined fluxes of Si II, Si IV, C III, and O V lines in the COS spectra, assuming that epoch mid-2015 is affected by the same active region or longitude. The light curves were phase-folded to the rotational period of the star GJ 436 (44.09 d); the amplitude and baseline are measured in fraction of the mean average flux. The black data points are bins of groups of observations near the same phase. The fits were performed to the orbit-to-orbit data and not to the binned data.