\begin{table}%t1
\caption{Summary of linear fits $a=-\gamma_1(v-v_0)$.}\label{t1}
%\centering
\par
\begin{tabular}{lcccc}
     \hline
     \hline
 $a_{\rm m}(v_i)$ & Data &    $\gamma_1$       &   $v_0$      & $C$  \\
             & set &   $10^{-3}$ s$^{-1}$ &
km~s$^{-1}$ &      \\
     \hline
  &  \multicolumn{2}{c}{complete sets} \\
 $a_{\rm m}(v_{\rm m})$ & n4vm  & $0.0106\pm0.0012$ &  $403\pm28$ & 0.13  \\
 $a_{\rm m}(v_{\rm m})$ & n6vm  & $0.0101\pm0.0010$ &  $445\pm18$ & 0.16  \\
 $a_{\rm m}(v_3)$ & n4v3  & $0.0288\pm0.0010$ &  $421\pm10$ & 0.41  \\
 $a_{\rm m}(v_3)$ & n6v3  & $0.0241\pm0.0008$ &  $431\pm7$  & 0.46  \\
 $a_{\rm m}(v_5)$ & n4v5  & $0.0193\pm0.0011$ &  $445\pm9$  & 0.25  \\
 $a_{\rm m}(v_5)$ & n6v5  & $0.0196\pm0.0009$ &  $455\pm8$  & 0.34  \\
    \hline
       Mean &       & $0.019\pm0.007$   &  $430\pm20$ &  \\
    \hline
  &  \multicolumn{2}{c}{bin-averaged} \\
 $a_{\rm m}(v_{\rm m})$ & n4vm  & $0.0113\pm0.0016$ &   $303\pm65$ & 0.90 \\
 $a_{\rm m}(v_{\rm m})$ & n6vm  & $0.0108\pm0.0016$ &   $350\pm45$ & 0.92 \\
 $a_{\rm m}(v_3)$ & n4v3  & $0.0266\pm0.0007$ &   $407\pm15$ & 0.96 \\
 $a_{\rm m}(v_3)$ & n6v3  & $0.0244\pm0.0009$ &   $425\pm7$  & 0.99 \\
 $a_{\rm m}(v_5)$ & n4v5  & $0.0186\pm0.0033$ &   $368\pm71$ & 0.89 \\
 $a_{\rm m}(v_5)$ & n6v5  & $0.0188\pm0.0025$ &   $401\pm58$ & 0.93 \\
     \hline
       Mean &       & $0.018\pm0.007$   &   $380\pm40$ &  \\
     \hline
\end{tabular}
\end{table}