(a) The Hα luminosities vs. sizes of the H ii regions in the original sample (dots and contours) and in Scoville et al. (2001, dashed line). Contours represent the number density of H ii regions in the original sample. The solid line represents a power-law fit: L∝ D ^{3.04 ± 0.01}, and the dashed line represents a fit to the data in Scoville et al. (2001): L∝ D ^{2.16 ± 0.02}. (b) The Hα luminosities vs. sizes of the grouped H ii regions (dots) and the H ii regions in Gutierrez et al. (2011, dashed line). The solid line represents a power-law fit: L∝ D ^{2.78 ± 0.02}, and the dashed line represents a fit to the data in Gutierrez et al. (2011): L∝ D ^{2.29 ± 0.03}. (c) The Hα luminosities vs. sizes of the H ii regions in the group sample (dots) and in Gutierrez et al. (2011, dashed line). The solid line represents a power-law fit: L∝ D ^{2.78 ± 0.01}, and the dashed line represents a fit to the data in Gutierrez et al. (2011): L∝ D ^{2.29 ± 0.03}.