Table 5: Fraction (in %) of the number of H II regions for each galaxy with $\rm\sigma _{nt}<13$ km s^-1 and $\rm\sigma _{nt}>13$ km s^-1 and the mean value of the relative errors in the velocity dispersion of the central components for these two groups of H II regions.
H II regions with $\rm\sigma _{nt}>13$ km s^-1 H II regions with $\rm\sigma _{nt}<13$ km s^-1

Galaxy Fraction $\Delta\rm\sigma_{nt}$ Fraction $\Delta\rm\sigma_{nt}$

NGC 1530 88.2% 4.1% 11.8% 32.1%

NGC 3359 54.4% 4.6% 45.6% 24.9%

NGC 6951 48.4% 3.8% 51.6% 27.8%

**Table 5:** Fraction (in %) of the number of H II regions for each galaxy with $\rm\sigma _{nt}<13$ km s^-1 and $\rm\sigma _{nt}>13$ km s^-1 and the mean value of the relative errors in the velocity dispersion of the central components for these two groups of H II regions.
	H II regions with $\rm\sigma _{nt}>13$ km s^-1	H II regions with $\rm\sigma _{nt}<13$ km s^-1
Galaxy	Fraction	$\Delta\rm\sigma_{nt}$	Fraction	$\Delta\rm\sigma_{nt}$
NGC 1530	88.2%	4.1%	11.8%	32.1%
NGC 3359	54.4%	4.6%	45.6%	24.9%
NGC 6951	48.4%	3.8%	51.6%	27.8%

Source LaTeX | All tables | In the text

	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