**Table 2:** Optimized decomposition of the sub-damped profile shown in Fig. 1. The listed numbers correspond to a straight continuum, for a curved continuum the errors increase. The origin of the radial velocity scale corresponds to the redshift z=1.15080. Note that the non-damped absorption does provide only little information. The line parameters are listed for completeness only.
Transition	$\phantom{-}v_{\rm r}$	b	$\log N$
	$\phantom{-}$ (km s $\ensuremath{^{-1}}$ )	(km s $\ensuremath{^{-1}}$ )	(cm $\ensuremath{^{-2}}$ )
H I 1216	$-3.19 \pm 11.14$	$75.17 \pm 5.84$	$19.89 \pm 0.03$
H I 1216	-236.14	$82.74 \pm 7.23$	$16.84 \pm 0.92$
H I 1216	-533.51	$82.74 \pm 7.23$	$14.98 \pm 0.13$

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