Fig. 8
Velocity dispersion vs. Hα luminosity corrected for internal extinction and metallicity effects. The lines show different fits for extragalactic giant HII regions which are approximately in virial equilibrium, given by: Terlevich & Melnick (1981) (solid line), Relaño et al. (2005) (dotted line) and Rozas et al. (2006a) (dashed line).
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