**Table 2:** High-contrast absorption line systems.
QSO	$z_{{\rm abs}}$	$\Delta \alpha /\alpha$ (10^-5)	$\log N(\hbox{H~{\sc i}~})$	Ref.
0100+13	2.310	- $3.941\pm1.368$	21.40	(PW99)
0149+33	2.140	- $5.112\pm2.118$	20.50	(PW99)
0201+37	1.955	$1.989\pm1.048$	20.20	(PW96)
0201+37	2.462	$0.572\pm1.719$	20.40	(PW96)
0528-25	2.141	- $0.853\pm0.880$	20.70	(L96)
0528-25	2.811	$0.850\pm0.846$	21.20	(L96)
0841+12	2.374	$2.277\pm3.816$	20.95	(PW99)
0841+12	2.374	$1.435\pm1.227$	20.95	(PW99)
0841+12	2.476	- $4.304\pm1.944$	20.78	(PW99)
1011+43	2.959	$2.475\pm1.706$	.....	(C02)
1215+33	1.999	$5.648\pm3.131$	20.95	(PW99)
1759+75	2.625	- $0.750\pm1.387$	20.80	(P01)
1759+75	2.910	- $0.492\pm1.645$	19.80	(O99)
1850+40	1.990	- $1.663\pm0.859$	.....	(C02)
2206-20	1.920	$1.878\pm0.702$	20.65	(PW97)
2230+02	1.859	- $5.407\pm1.179$	<20.85	(PW99)
2230+02	1.864	- $0.998\pm0.492$	20.85	(PW99)
2231-00	2.065	- $2.604\pm1.015$	20.56	(PW99)
2231-00	2.065	$1.707\pm1.249$	20.56	(PW99)
2231-00	2.653	- $3.348\pm1.904$	<20.30	(L91)
2343+12	2.430	- $1.224\pm0.389$	20.34	(L98)
2359-02	2.095	- $0.068\pm0.722$	20.70	(PW99)

(L91) Lanzetta et al. (1991); (L96) Lu et al. (1996); (L98) Lu et al. (1998); (O99) Outram et al. (1999); (PW96) Prochaska & Wolfe (1996); (PW97) Prochaska & Wolfe (1997); (PW99) Prochaska & Wolfe (1999); (P01) Prochaska et al. (2001); (C02) Currant et al. (2002).

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