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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