\begin{table}%T1
\caption{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.~\ref{fig:allmaps1} and~\ref{fig:allmaps2}.} 
\label{tab:obs}
%\small
%\centerline
 {
\begin{tabular}{lrcccc}
\hline\hline
Epoch & 
\multicolumn{1}{c}{$\nu$} & 
\multicolumn{1}{c}{$S_{\rm tot}$} & 
\multicolumn{1}{c}{Beam} &
\multicolumn{1}{c}{$S_{\rm peak}$} & 
\multicolumn{1}{c}{3$\sigma$}\\
 & 
\multicolumn{1}{c}{[GHz]} & 
\multicolumn{1}{c}{[Jy]} & 
\multicolumn{1}{c}{[mas~$\times$~mas], [$^\circ$]} &
\multicolumn{1}{c}{$\left[\rm \frac{Jy}{beam}\right]$} & 
\multicolumn{1}{c}{$\left[\frac{\rm mJy}{\rm beam}\right]$}\\
\hline                                                                              %rms [Jy]
1992.73~$^{a,(1)}$&  5.0 & 0.67 & $0.8\times1.0$,\hspace{9.5pt}   0 & 0.61 & 1.5 \\ %rms 0.00034
{\bf 1992.85}~$^a$& 22.2 & 0.75 & $0.9\times2.7$,\hspace{0pt} $-55$ & 0.64 & 3.0 \\ %rms 0.00077
{\bf 1993.71}~$^a$& 22.2 & 0.40 & $0.2\times0.2$,\hspace{5.5pt}  35 & 0.31 & 2.0 \\ %rms 0.00079
{\bf 1994.21}      &  8.4 & 0.32 & $0.8\times1.4$,\hspace{5.5pt}  80 & 0.26 & 0.7 \\ %rms 0.00020
{\bf 1994.21}      & 22.2 & 0.34 & $0.3\times0.5$,\hspace{5.5pt}  79 & 0.30 & 1.8 \\ %rms 0.00072
1994.67~$^{(2)}$  & 15.3 & 0.46 & $0.5\times0.7$,\hspace{0pt} $-29$ & 0.40 & 1.8 \\ %rms 0.00056
1994.70~$^{a,(1)}$&  5.0 & 0.36 & $0.8\times1.2$,\hspace{0pt} $-15$ & 0.29 & 2.7 \\ %rms 0.00070
1995.15~$^{(3)}$  & 22.2 & 0.75 & $0.3\times0.5$,\hspace{4pt}  $-3$ & 0.71 & 4.0 \\ %rms 0.00200
1995.31~$^{(3)}$  & 22.2 & 0.43 & $0.3\times0.4$,\hspace{5.5pt}  39 & 0.40 & 4.2 \\ %rms 0.00218
1995.47~$^{(3)}$  & 22.2 & 0.20 & $0.3\times0.6$,\hspace{9.5pt}   7 & 0.18 & 3.0 \\ %rms 0.00135
{\bf 1995.65}      &  8.4 & 0.31 & $0.9\times1.0$,\hspace{5.5pt}  54 & 0.26 & 0.4 \\ %rms 0.00012
{\bf 1995.65}      & 22.2 & 0.34 & $0.3\times0.4$,\hspace{0pt} $-40$ & 0.28 & 1.8 \\ %rms 0.00082
1996.34~$^{(3)}$  & 22.2 & 0.27 & $0.3\times0.9$,\hspace{5.5pt}  48 & 0.22 & 3.2 \\ %rms 0.00158
1996.53~$^{(2)}$  & 15.3 & 0.26 & $0.5\times0.7$,\hspace{0pt} $-15$ & 0.22 & 0.7 \\ %rms 0.00022
1996.60~$^{(3)}$  & 22.2 & 0.25 & $0.4\times0.4$,\hspace{9.5pt}   9 & 0.21 & 3.0 \\ %rms 0.00110
1996.63~$^{a,(1)}$&  5.0 & 0.22 & $1.4\times2.2$,\hspace{5.5pt}  41 & 0.18 & 1.3 \\ %rms 0.00049
1996.82~$^{(2)}$  & 15.3 & 0.26 & $0.4\times0.7$,\hspace{5.5pt}  21 & 0.25 & 2.0 \\ %rms 0.00076
1996.90~$^{(3)}$  & 22.2 & 0.29 & $0.4\times0.5$,\hspace{0pt} $-35$ & 0.27 & 2.0 \\ %rms 0.00078
1997.03~$^{(4)}$  &  8.4 & 0.21 & $1.1\times1.4$,\hspace{9.5pt}   7 & 0.18 & 0.0 \\ %rms 0.00177
1997.58~$^{(3)}$  & 22.2 & 0.98 & $0.4\times0.5$,\hspace{0pt} $-33$ & 0.90 & 4.0 \\ %rms 0.00164
1997.93~$^{(5)}$  &  8.4 & 0.43 & $0.6\times1.6$,\hspace{5.5pt}  33 & 0.38 & 0.5 \\ %rms 0.00017
1999.41~$^{(5)}$  &  8.4 & 1.02 & $0.5\times1.5$,\hspace{4pt}  $-7$ & 0.92 & 0.5 \\ %rms 0.00016
1999.55~$^{(2)}$  & 15.3 & 1.25 & $0.5\times0.8$,\hspace{9.5pt}   4 & 1.14 & 1.2 \\ %rms 0.00040
1999.89~$^{a,(1)}$&  5.0 & 0.63 & $1.8\times2.4$,\hspace{0pt} $-60$ & 0.54 & 0.7 \\ %rms 0.00016
{\bf 2000.82}~$^b$&  5.0 & 0.55 & $0.8\times0.9$,\hspace{0pt} $-28$ & 0.48 & 0.1 \\ %rms 0.00003
2001.17~$^{(2)}$  & 15.3 & 0.65 & $0.4\times0.8$,\hspace{5.5pt}  31 & 0.54 & 0.9 \\ %rms 0.00033
\hline		
\end{tabular}
}\smallskip
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) \cite{1999bllp.conf..431B} and in prep.\ (2005), (2) \cite{1998AJ....115.1295K} \&
\cite{2002AJ....124..662Z}, (3) \cite{2001ApJS..134..181J}, (4)
\cite{2000ApJS..128...17F}, (5) \cite{2001AaA...376.1090R}.
\end{table}