\begin{table}%t3
%\centering
\par
\caption{\label{tab:var_time}HST-1 variability timescale and characteristic size during the rise and fall of the 2005 flare.}
\begin{tabular}{lcccc}
\hline\hline
\noalign{\smallskip}
Wavelength                   & $\tau_{{\rm rise}}$ & $\tau_{{\rm fall}}$ & $\theta_{{\rm rise}}$ & $\theta_{{\rm fall}}$  \\
 &\scriptsize{[yr]}   & \scriptsize{[yr]} & \scriptsize{[mas]} & \scriptsize{[mas]}  \\
\hline
VLA $\lambda$2~cm           & 1.5        & 4.9  & 8.7~$\delta$\tablefootmark{a} & 28~$\delta$     \\ 
VLBA $\lambda$2~cm (beam A) & 1.0        & 4.2  & 5.6~$\delta$ & 24~$\delta$      \\ 
VLBA $\lambda$2~cm (beam B) & 1.0        & 2.7  & 5.7~$\delta$ & 15~$\delta$      \\
\hline
\end{tabular}
\tablefoot{
\tablefoottext{a}{The characteristic size is related to the Doppler factor $\delta$.}}
\end{table}