Table 1: The objects for which no reliable polarization measurements could be derived.

Date	Object
dd-mm-yyyy
27-08-2000	PKS 2357-318
23-03-2002	SDSS J0948+0024, SDSS J1217-0029
23-03-2002	SDSS J1235-0036, PKS 1308+145
21-04-2002	SDSS J1217-0029, SDSS J1235-0036
02-05-2002	CTS A09.82
20-08-2003	PKS 2357-318
21-08-2003	1WGA J2201.6-5646
22-08-2003	PKS 2314-116
19-10-2003	4C 19.74