Evolution of the radii of high-mass stars in time (up to 0.5 Myr, i.e. approximately 3.5 t_cr) of the 9.2k model (one realisation each of seg and non is plotted). Colours represent stars in different mass bins (from 5 M_⊙ <  m ≤ 7 M_⊙ up to m >  25 M_⊙). The bins contain 39, 26, 18, 13, and 11 stars, respectively. The mean position within each bin is given. Radii with respect to the coordinate origin (dashed lines) and the density centre (solid lines) are plotted.