Relation between the ratio of the total Hα luminosity of H II regions with L(Hα) ≥ 10³⁷ erg s⁻¹ (upper panel), of the brightest H II region (central panel), and of the sum of the Hα luminosity of the brightest three H II regions and the integrated Hα luminosity and the specific star formation rate of the parent galaxies. The black dashed line shows the best fit to the data (bisector fit). The dot in the lower right corner shows the typical error bar in the data.