Total (left panel) and nonthermal radio continuum flux (right panel) at 5 GHz for MIR-selected star forming regions plotted as a function of the Hα flux corrected for extinction. The Hα emission appears to be more closely related to the total radio flux than to the nonthermal radio continuum only. The fitted correlations shown are drawn by minimizing distances to the line and their slopes are 0.87 and 0.93 for the total and nonthermal flux respectively. Plotted quantities are relative to circular apertures with R_ap = 1.5R_s. The green dashed line is the best fitted line with slope unity.