Comparison of the accreting evolutionary tracks from protostars to the classical pre-main-sequence evolution. The thick black line shows our accreting standard model and the thin black line the pre-main-sequence models evolved from this accreting model. Red lines show classical pre-man sequence tracks with the same masses at the ZAMS as the pre-main-sequence models from the accretion protostar The ZAMS is shown as grey line. The grey shaded area at higher temperatures marks the position of (post-) main-sequence stars according to our interpretation. The colour code of the stars is the same as in Fig. 1.