Stellar evolutionary tracks in comparison with the HD 135344 AB binary system. The parameters of the primary star have been estimated in this work, but here showing inflated uncertainties of σ_Teff = 200 K and σ_{log L/L⊙} = 0.1 dex. The parameters of the secondary star have been adopted from Fairlamb et al. (2015) and were corrected to the Gaia DR3 distance. The pre-main-sequence tracks are adopted from Siess et al. (2000). Stellar masses are provided next to the pre-main-sequence tracks in solar masses. The brown dashed line shows the zero age main-sequence (ZAMS; L_nuclear > 0.99L_total), which is at 13.7 Myr for HD 135344B (M_* = 1.5 M_⊙). The solid line is the early main-sequence, defined as the moment when the CNO cycle of intermediate-mass stars has reached its equilibrium.