Radial velocity observations and derived models of the contact binary system XY Leo A. The filled circular dots represent the primary component and the open circles the radial secondary. The solid line represents the primary star and the purple dashed line the secondary star. The reanalyzed observations are taken from the studies published earlier (B. J. Hrivnak et al. 1984; S. C. Barden 1987; T. Pribulla et al. 2007; H84, B87, P07). See the text for details.