Light curves of four eclipses phased with a constant period according to the new linear ephemeris (Eq. (2)). The open symbols denote archival photographic photometric data (squares: E = 0, circles: E = 1, diamonds: E = 2). The V-band ASAS data (filled circles: E = 8) have been shifted arbitrarily by  + 0.6 for facilitate comparison with the light curves from the different photometric systems.