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Table 1

Telescopes and instrumental setups.

Telescope Instrument R Δλ [Å]

Sloan SDSS 1800 3800−9200
ESO-VLT FORS1 1800 3730−5200
WHT ISIS 4000 3440−5270
CAHA-3.5 m TWIN 4000 3460−5630
ESO-NTT EFOSC2 2200 4450−5110
SOAR Goodman 2500 3500−6160 a
Goodman 7700 3700−4400
Gemini GMOS-N/S 1200 3770−4240
INT IDS 1400 3000−6800
IDS 4000 3930−5100 b



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