Table 7: Representative fits to the envelopes of the log  $L_{\scriptsize\mbox{H$\alpha$ }} - \log~\rm\sigma_{nt}$ distributions for NGC 1530, NGC 3359 and NGC 6951 and for the distribution defined with all the H  II regions in the three galaxies. The logarithmic H$\alpha $ luminosity corresponds to the value given in the calibration catalogue.
  Bin Envelope fit
NGC 1530 0.15 log  $L_{\scriptsize\mbox{H$\alpha$ }} \sim (37.0 \pm 0.3)+(2.0 \pm 0.2)~\log~\rm\sigma_{nt}$
NGC 3359 0.15 log  $L_{\scriptsize\mbox{H$\alpha$ }} \sim (37.5 \pm 0.4)+(1.4 \pm 0.7)~\log~ \rm\sigma_{nt}$
NGC 6951 0.15 log  $L_{\scriptsize\mbox{H$\alpha$ }} \sim (37.7 \pm 0.4)+(1.2 \pm 0.4)~\log~ \rm\sigma_{nt}$
All galaxies 0.15 log  $L_{\scriptsize\mbox{H$\alpha$ }} \sim (37.4 \pm 0.2)+(1.78 \pm 0.14)~\log~ \rm\sigma_{nt}$


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Article Contents
1 Introduction
2 The observations
3 Relating the photometric and spectroscopic data sets
4 Extraction of the line profiles
5 Spectral analysis
6 The luminosity v. non-thermal velocity dispersion relation
7 The masses of the H II regions in the log L ${_{\scriptsize {\rm H \alpha}}}$ - log  ${\sigma _{\rm nt}}$ diagram
8 Conclusions
Appendix A: The effects of different H II region size estimate criteria
References
List of tables
List of figures