Numerical tests exploring the pre-MS evolution of accreting models. left panel: Zoomed-in region of the pre-MS of three models: Ascending M_⊙ (black line), model 491 (red line), and model 6127 (green line) shown in the HR diagram. For the ascending model, the accretion rate begins as 10⁻³ M_⊙/yr, changes every 10 years by a factor of five until it reaches 50M_⊙/yr at the age of 110 years. The pre-MS evolution is very similar to that of models 491 and 6127, showing that at least in the early contraction phase, changing the accretion rate has minimal impact on the evolutionary track. Right panel: Impact of FITM on 10⁻² M_⊙ yr⁻¹ models. The black line represents a FITM of 0.990 and the red line depicts a FITM of 0.999.