We thank Hans Hagen for kindly providing the coordinates of two quasars of the Hamburg QSO survey for this investigation. We would like to express sincere thanks to the staff of the Paranal observatory for the efficient and friendly support of the FORS commissioning team and the commissioning team itself. We would also like to thank Fred Hamann for many suggestions and discussions improving the paper. The investigators have benef ited from support from: SFB 328 D and SFB 439 (Landessternwarte Heidelberg) DFG grant Ko 857/13-1 (Universitätssternwarte Göttingen).
© European Southern Observatory (ESO) 2000
Online publication: January 31, 2000