Dependence of the kinetic energy of ionised gas E_kin in the regions of locally elevated velocity dispersion on the total mechanical energy input from the stellar associations in the form of supernovae and stellar winds (left panels), and supernovae alone (right panels). Top and bottom panels correspond to the and density measurements (thus representing upper and lower limits of E_kin, respectively). Median value of logarithmic errors is shown in bottom-right corner of each panel. All regions with errors 2 times larger than presented are excluded from the plots. Colour encodes the [S II]/Hα lines ratio tracing the dominant gas excitation mechanism ([S II]/Hα > 0.4 is likely produced by shocks; left panels), or the relative contribution of the SNe to the total mechanical energy input according to the STARBURST99 models for the corresponding mass and age of each cluster right panels. Blue, orange, green and red lines correspond to mechanical stellar feedback energy efficiency η = 100, 30, 5, 1%, respectively. Spearman correlation coefficient ρ is given above the plots.