Table 1: The epochs, frequencies and arrays of the VLBI observations described in this paper. In Col. 4 we indicated the polarization mode of the observation. In Col. 5 references for previously published data are given.

Epoch	Frequency	Instrument	Pol.	Reference
1992.44	22 GHz	EVN (8 stations)	LL	this paper
1994.17	22 GHz	VLBA (8 stations) + VLA + EVN (4 stations)	LL	this paper
1995.27	15 GHz	VLBA (2 cm Survey)	RR	Kellermann et al. (2004)
1995.96	15 GHz	VLBA (2 cm Survey)	LL	Kellermann et al. (2004)
1996.73	43 GHz	VLBA+EB	full	this paper
1996.73	22 GHz	VLBA+EB	full	this paper
1996.73	15 GHz	VLBA+EB	full	this paper
1996.82	5 GHz	EVN (8 stations)	LL	this paper
1996.83	8 GHz	EVN (8 stations)	RR	this paper
1997.19	15 GHz	VLBA (2 cm Survey)	LL	this paper
1998.14	1.6 GHz	EVN (9 stations)	LL	this paper
1999.01	15 GHz	VLBA (2 cm Survey)	LL	Kellermann et al. (2004)
2001.17	15 GHz	VLBA (2 cm Survey)	LL	Kellermann et al. (2004)
2001.98	15 GHz	VLBA (2 cm Survey)	LL	Kovalev et al. (2005)
2003.04	22 GHz	VLBA	full	Bach (2004)
2003.04	15 GHz	VLBA	full	Bach (2004)
2003.16	15 GHz	VLBA (MOJAVE)	full	Kovalev et al. (2005); Lister & Homan (2005)