Radial distribution of the number of HII regions of luminosity L(Hα) > 10³⁷ erg s⁻¹ in units of effective radii for massive- (M_star >  10^9.5 M_⊙ – left panel), intermediate- (10⁸ <  M_star ≤ 10^9.5 M_⊙ – middle panel), and low-mass galaxies (10^6.5 <  M_star ≤ 10⁸ M_⊙ – right panel). The blue and red values give the numbers of HII regions used to construct the histograms for HI-normal (HI-def ≤ 0.5) and HI-deficient galaxies (HI-def > 0.5), respectively.