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Table 1

Optical V-band imaging.

Source z Date tint (s) Airmass

3C 293 0.045 13/03/07 3600 (12 × 300) 1.0
3C 305 0.041 05/04/08 5400 (6 × 900) 1.2
4C 12.50 0.123 06/04/08 5400 (6 × 900) 1.1

Notes. tint is the on-source integration time (# frames × time per frame).

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