H-R and mass–radius diagrams of the four confirmed component stars A1 (black filled circle), A2 (black circle), B1 (orange filled circle), and B2 (orange circle) of the XY Leo multiple system. Observed quantities for other well-studied W-type (blue), A-type (green) contact binaries, and detached systems (purple) are also shown for comparison, along with the zero-age main sequence (red lines; O. R. Pols et al. 1995; K. Yakut & P. P. Eggleton 2005). Filled circles indicate primary components; open circles indicate secondary components.