**Table 4:** Mean values of ${\rm NH_3}$ core samples.
Sample	FWHM ( $\rm km~s^{-1}$ )	$T_{\rm kin}$ (K)	size(pc)	$M_{\rm NH_3 }$ ( ${M}_\odot$ )	$\Sigma$
Taurus	0.33	10	0.06	1.1	0.08
Perseus	0.55	13	0.12	9	0.16
Orion	1.12	17	0.15	21	0.24
IRDC cores	1.7	15	0.57	492	0.40

Notes: Columns are the source sample, the mean FWHM of the ${\rm NH_3}$ (1, 1) line, kinetic temperature, size of the core, mass as determined from ${\rm NH_3}$ assuming a fractional abundance of ${\rm NH_3}$ relative to $\rm H_2$ and the mean surface density. The mean values for dense cores in Taurus, Perseus and Orion have been taken from Ladd et al. (1994).

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