Evolutionary tracks whose final masses are 0.5, 0.8, and 1 M_⊙ for the cases of ξ = 0 (green lines), 0.05 (blue), and 0.1 (magenta dot-dashed). The initial radius is 1.5 R_⊙ and X_D = 20 ppm (solid lines) and 35 ppm (dashed). Some are merged to the Hayashi track of the non-accreting evolutionary tracks (black dotted), and others are not. Thus, the mass determination of stars on the Hayashi phase is not affected by the variation in accretion heat. As already discussed, the age determination is affected by ξ. Pluses, crosses, and asterisks denote 1, 5, and 10 million years, respectively. The filled and open circles represent the primary and secondary of the eclipsing binaries CoRoT 223992193, respectively (Stassun et al. 2014). For the cases of X_D = 20 ppm, their age is estimated to 1 or 5 million years if ξ = 0.05 or 0.1, respectively.