**Table 3:** DLAs vs. sub-DLAs, and intervening vs. proximate systems.
Category^a	#	$\langle$ log $N_{\rm C {\sc iv}}\rangle$	$\langle\Delta v_{\rm C {\sc iv}}\rangle$	$\langle\vert\bar{v}_{\rm C {\sc iv}}\vert\rangle$	$\langle{\rm log}\,N_{\rm H {\sc ii}}\rangle$
		(N in cm^-2)	(kms^-1)	(kms^-1)	(N in cm^-2)
DLAs	63	14.27 $\pm$ 0.57	251 $\pm$ 211	68 $\pm$ 83	19.77 $\pm$ 0.44
Sub-DLAs	11	14.07 $\pm$ 0.67	272 $\pm$ 281	73 $\pm$ 54	19.33 $\pm$ 0.48
Intervening	67	14.28 $\pm$ 0.58	264 $\pm$ 226	71 $\pm$ 81	19.73 $\pm$ 0.47
Proximate^b	7	13.93 $\pm$ 0.57	153 $\pm$ 131	43 $\pm$ 58	19.48 $\pm$ 0.38

^a Each entry in this table shows the mean and standard deviation of the given property in the given category. ^b Proximate absorbers are those within 5000km s^-1 of the QSO redshift. All others are intervening.

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