Table 1: Journal of observations.
Quasar V $z_{\rm em}$ $z_{\rm abs}$ Observing date Mode Wavelength range Exposure time

[mag] [nm] [s]

Q0100+13 16.6 2.69 2.309 September 2001 dic2 (390+860) 330-452/670-1000 7200

Q1331+17 16.7 2.08 1.776 June-July 2001 dic1 (346+860) 312-387/670-1000 13 500

Q2231-00 17.5 3.02 2.066 September 2000 dic2 (390+800) 335-452/610-990 15 700

Q2343+12 17.0 2.55 2.431 August 2001 dic1 (346+860) 315-387/670-1000 14 400

**Table 1:** Journal of observations.
Quasar	V	$z_{\rm em}$	$z_{\rm abs}$	Observing date	Mode	Wavelength range	Exposure time
	[mag]					[nm]	[s]
Q0100+13	16.6	2.69	2.309	September 2001	dic2 (390+860)	330-452/670-1000	7200
Q1331+17	16.7	2.08	1.776	June-July 2001	dic1 (346+860)	312-387/670-1000	13 500
Q2231-00	17.5	3.02	2.066	September 2000	dic2 (390+800)	335-452/610-990	15 700
Q2343+12	17.0	2.55	2.431	August 2001	dic1 (346+860)	315-387/670-1000	14 400

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