**Table 1:** Observation log. Listed are the observing epoch, frequency $\nu$ , total flux density $S_{\rm tot}(\nu )$ , beam size, beam position angle, peak flux density $S_{\rm peak}$ and the lowest contour at 3 $\sigma$ of the map in Figs. 1 and 2.
Epoch	$\nu$	$S_{\rm tot}$	Beam	$S_{\rm peak}$	3 $\sigma$
	[GHz]	[Jy]	[mas $\times$ mas], [ $^\circ$ ]	$\left[\rm\frac{Jy}{beam}\right]$	$\left[\frac{\rm mJy}{\rm beam}\right]$
1992.73 ^a,(1)	5.0	0.67	$0.8\times1.0$ , 0	0.61	1.5
1992.85 ^a	22.2	0.75	$0.9\times2.7$ , -55	0.64	3.0
1993.71 ^a	22.2	0.40	$0.2\times0.2$ , 35	0.31	2.0
1994.21	8.4	0.32	$0.8\times1.4$ , 80	0.26	0.7
1994.21	22.2	0.34	$0.3\times0.5$ , 79	0.30	1.8
1994.67 ⁽²⁾	15.3	0.46	$0.5\times0.7$ , -29	0.40	1.8
1994.70 ^a,(1)	5.0	0.36	$0.8\times1.2$ , -15	0.29	2.7
1995.15 ⁽³⁾	22.2	0.75	$0.3\times0.5$ , -3	0.71	4.0
1995.31 ⁽³⁾	22.2	0.43	$0.3\times0.4$ , 39	0.40	4.2
1995.47 ⁽³⁾	22.2	0.20	$0.3\times0.6$ , 7	0.18	3.0
1995.65	8.4	0.31	$0.9\times1.0$ , 54	0.26	0.4
1995.65	22.2	0.34	$0.3\times0.4$ , -40	0.28	1.8
1996.34 ⁽³⁾	22.2	0.27	$0.3\times0.9$ , 48	0.22	3.2
1996.53 ⁽²⁾	15.3	0.26	$0.5\times0.7$ , -15	0.22	0.7
1996.60 ⁽³⁾	22.2	0.25	$0.4\times0.4$ , 9	0.21	3.0
1996.63 ^a,(1)	5.0	0.22	$1.4\times2.2$ , 41	0.18	1.3
1996.82 ⁽²⁾	15.3	0.26	$0.4\times0.7$ , 21	0.25	2.0
1996.90 ⁽³⁾	22.2	0.29	$0.4\times0.5$ , -35	0.27	2.0
1997.03 ⁽⁴⁾	8.4	0.21	$1.1\times1.4$ , 7	0.18	0.0
1997.58 ⁽³⁾	22.2	0.98	$0.4\times0.5$ , -33	0.90	4.0
1997.93 ⁽⁵⁾	8.4	0.43	$0.6\times1.6$ , 33	0.38	0.5
1999.41 ⁽⁵⁾	8.4	1.02	$0.5\times1.5$ , -7	0.92	0.5
1999.55 ⁽²⁾	15.3	1.25	$0.5\times0.8$ , 4	1.14	1.2
1999.89 ^a,(1)	5.0	0.63	$1.8\times2.4$ , -60	0.54	0.7
2000.82 ^b	5.0	0.55	$0.8\times0.9$ , -28	0.48	0.1
2001.17 ⁽²⁾	15.3	0.65	$0.4\times0.8$ , 31	0.54	0.9

Note: The array used was the VLBA, unless indicated by a footnote. Epochs in bold face denote own data. a: Global array, b: VLBA+Eb.
References: (1) Britzen et al. (1999) and in prep. (2005), (2) Kellermann et al. (1998) & Zensus et al. (2002), (3) Jorstad et al. (2001b), (4) Fey & Charlot (2000), (5) Ros et al. (2001).

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