\begin{table}%t1 devient %t2
%\centering
\par
\caption{\label{speeds}Proper motion and apparent speeds of the individual jet 
components in 0735+178 (Sect.~3).}
\par
\begin{tabular}{lccc}
 \hline\hline\noalign{\smallskip}
              Mode&Component& $\mu$ [mas/year]&$\beta_{\rm app}$ [$c$]      \\
              \hline
{\it staircase}&c1 &0.03  $\pm$ 0.01&0.77  $\pm$ 0.26     \\
              &c2 & 0.46 $\pm$0.16& 11.87  $\pm$ 4.16   \\
              &c3& 0.22  $\pm$ 0.02 & 5.68  $\pm$ 0.52 \\
              &c4 &0.22  $\pm$ 0.04 & 5.68  $\pm$ 1.03  \\
              &c5 &--0.13  $\pm$ 0.03 & --3.36  $\pm$ 0.77   \\
  \hline
              {\it straight}&ca & 0.01  $\pm$ 0.01&  0.26 $\pm$ 0.26  \\
              &cb & 0.02  $\pm$ 0.02&   0.52  $\pm$ 0.52  \\
              &cc & 0.01  $\pm$ 0.02&  0.26  $\pm$ 0.52  \\
              &cd &  0.01  $\pm$ 0.02&  0.26  $\pm$ 0.52   \\
              \noalign{\smallskip}
              \hline
\end{tabular}
     \end{table}