Time evolution of extinction corrected total Hα luminosity of the regions as a function of FUV/Hα luminosity ratio. The continuous line in each panel refer to a solar metallicity burst model with stellar mass and IMF upper end mass cut-off as indicated by M_* and M_up. Time increases from bottom to top along the curves with asterisks marking time steps of 1 Myr from 1 to 7 Myr. The M_* value in each panel has been chosen to best match the evolutionary model with the data, dashed lines indicate model predictions for 0.2 dex variations in M_*. Some theoretical values of absolute visual magnitudes during cluster evolution are printed to the right of the horizontal tick marks indicating the time step. The extinction-corrected value of FUV/Hα luminosity ratio for the 4 H II regions, color coded as in Fig. 3, is plotted with filled squares and is measured in circular apertures with a 3.8″ radius.