Distribution of postinteraction donors in detached binaries with Roche-lobe filling factors < 0.6 (shown in grayscale) from all the grid models interacting after the end of MS, that is through case B mass transfer, plotted for the Solar metallicity (left) and the LMC composition (right). Overplotted are several donor tracks from selected binary models (colored lines) as well as single stellar tracks for comparison (gray lines). The mass transfer phase is shown in bold. Crosses are spaced by 50 000 yr starting from the onset of RLOF. We note that models were not weighted by the initial-mass function or the initial period distribution to construct the distribution. In all the Solar metallicity models, thermal-timescale mass transfer leads to the formation of hot stripped stars. In the LMC models, primaries above the initial mass of M₁ ≥ 17 M_⊙ become only partially stripped and as postinteraction stars can largely overlap with single-stellar tracks.