Isochrones for SMC (left panels), LMC (center) and galaxy (right) composition. Each panel shows isochrones for a given age and initial rotational velocity ranging from 0 to 540 km   s^-1 in steps of 20 km   s^-1, with an increased resolution of 10 km   s^-1 between 350 and 450 km   s^-1 (grey lines). In red we show the isochrone for non rotating models, for other colors see the legend and the main text. We show the area spanned by the zero-age isochrones as a light blue band. The age in the second row has been chosen such that the isochrones span the largest range in effective temperature, 1 Myr earlier is shown in the first row, 1 and 5 Myr later are shown in the third and fourth row.