Relative intensity, I_λ, of the emission peak as a function of time for selected spectral lines, λ, and colored according to their orbital phase. The I_λ values have been divided by their maximum value over the time series to set them on a [0,1] interval, see text. The upper panel displays the B-band photometry. For each panel, a 227-day rolling mean is drawn in black. The SAP’s start, maximum, and end (vertical dotted lines) are shown. For the pink and gray lines, see the text.