Parameter T as a function of the logarithm of the SFR for the H II regions in our sample (left panels) and the contour plot of the same quantities obtained with bins of 0.4 in log (SFR) and of 7.7 in T (right panels). The data from the regions of NGC 628, NGC 5457, and NGC 6946 are represented in the uppermost, second and third panels, respectively. The whole sample of H II regions selected in this study is represented in the lowermost panel. In the right panels, the number of regions per bin is indicated by the colour bars.