Comparison of Leo A H II region with Hβ emission (grey contours) with HST/ACS photometry. The left panel shows the location of young MS stars (magenta triangles) and old stars (cyan squares). A 10 Myr PARSEC isochrone is shown with the black curve in order to obtain a proxy of the stellar masses of the young stars. The middle panel shows the spatial distribution of old stars in the H II region, whereas the right panel shows the distribution of young MS stars in the H II region. The most massive star is shown with the orange triangle, and those with masses of 8 < M_⊙ < 10 are shown with green triangles.