Left: same as Fig. 1 for Hα. Time runs downwards (see Table 1 for exact dates); associated phases are, from top to bottom, 0.97 (2004 data), 0.95, 0.72, 0.92, 0.09, 0.29, 0.49 (2006 data), 0.87 (2009 data). Right: Equivalent widths of Hα (top, black dots) and He IIλ4686 Å (bottom, stars) as a function of phase. These EWs correspond to integration of the profiles in 6545.0–6575.0 Å and 4676.0–4693.5 Å, respectively. The vertical dotted lines correspond to the eclipse limits.