H-R diagram of all the spectroscopically confirmed hot luminous stars in the MEDUSA region a) and R136 region b). W-R stars (red squares), Of/WN stars (cyan triangles), O-type stars (yellow circles) and B-type stars (blue diamonds). Isochrones at 1, 2, 3, and 5 Myr are overlaid in both cases, with 8 Myr also used for the MEDUSA region. The isochrones are based on rotating (νrot = 300 km s-1, dashed line) and non-rotating (νrot = 0 km s-1, solid line) evolutionary models of Brott et al. (2011) and Köhler et al. (in prep.). The ZAMS positions for stars with Minit = 20, 40, 60, 80, 100, 120, 150, 200, 300 and 400 M⊙ are marked by black stars and joined with a solid line.
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