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Fig. 1

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Left: circular-velocity gradient VRd/Rd versus R-band central surface brightness (inclination corrected). Right: VRd/Rd versus the mean H I surface density within Ropt. The black dots and squares show, respectively, BCDs with a diffuse/off-centered starburst and BCDs with a centrally-concentrated starburst. The blue dots and squares show, respectively, typical Irrs and compact Irrs (see Sect. 4.1 for details). The dashed lines show a linear-fit to the data.

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