Table 6: Variation of the log $L_{\scriptsize\mbox{H$\alpha$ }} - \log~\rm\sigma_{nt}$ envelope slope with the selected bin width. Each value and its error correspond respectively, to the median and standard deviation of the slopes for different bin starting points in log $L_{\scriptsize\mbox{H$\alpha$ }}$ .
Bin width NGC 1530 NGC 6951 NGC 3359

dex Frac of $L_{\scriptsize\mbox{H$\alpha$ }}$ Total $L_{\scriptsize\mbox{H$\alpha$ }}$ Frac of $L_{\scriptsize\mbox{H$\alpha$ }}$ Total $L_{\scriptsize\mbox{H$\alpha$ }}$ Frac of $L_{\scriptsize\mbox{H$\alpha$ }}$ Total $L_{\scriptsize\mbox{H$\alpha$ }}$

0.10 $2.4\pm0.2$ $1.9\pm0.3$ $0.8\pm0.2$ $0.8\pm0.2$ $1.6\pm0.3$ $1.1\pm0.3$

0.15 $2.4\pm0.2$ $2.0\pm0.2$ $1.2\pm0.4$ $1.2\pm0.4$ $1.5\pm0.2$ $1.4\pm0.3$

0.20 $2.4\pm0.2$ $1.9\pm0.1$ $1.6\pm1.9$ $1.6\pm1.9$ $1.6\pm0.2$ $1.4\pm0.3$

**Table 6:** Variation of the log $L_{\scriptsize\mbox{H$\alpha$ }} - \log~\rm\sigma_{nt}$ envelope slope with the selected bin width. Each value and its error correspond respectively, to the median and standard deviation of the slopes for different bin starting points in log $L_{\scriptsize\mbox{H$\alpha$ }}$ .
Bin width	NGC 1530	NGC 6951	NGC 3359
dex	Frac of $L_{\scriptsize\mbox{H$\alpha$ }}$	Total $L_{\scriptsize\mbox{H$\alpha$ }}$	Frac of $L_{\scriptsize\mbox{H$\alpha$ }}$	Total $L_{\scriptsize\mbox{H$\alpha$ }}$	Frac of $L_{\scriptsize\mbox{H$\alpha$ }}$	Total $L_{\scriptsize\mbox{H$\alpha$ }}$
0.10	$2.4\pm0.2$	$1.9\pm0.3$	$0.8\pm0.2$	$0.8\pm0.2$	$1.6\pm0.3$	$1.1\pm0.3$
0.15	$2.4\pm0.2$	$2.0\pm0.2$	$1.2\pm0.4$	$1.2\pm0.4$	$1.5\pm0.2$	$1.4\pm0.3$
0.20	$2.4\pm0.2$	$1.9\pm0.1$	$1.6\pm1.9$	$1.6\pm1.9$	$1.6\pm0.2$	$1.4\pm0.3$

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