\begin{table}%t1
%\tabcolsep=7pt
{%\centering
\par
\caption{\label{tab:measurements}\Lya\ DJ excursion amplitudes and kinematic quantities. }
\begin{tabular}{cccccc}
\hline \hline
\multicolumn{2}{c}{Feature type}  &
$A$  [arcsec]                     &
$|a|$  [m~s$^{-2}$]              &
$v_{\rm max}$  [km~s$^{-1}$]     &
$T$  [min]                        \\ % EOL
\hline
\multirow{2}{1.1cm}{\Lya\ DJs} &
decelerating                                                              &
\multirow{2}{3.7cm}{$0.6 \;(0.8\!\pm\!0.5)\; \langle0.2,2.2\rangle$}      &  % A
$165 \;(235\!\pm\!173)\; \langle44,650\rangle$  &  
$13  \;(17\!\pm\!9)\; \langle6,35\rangle$   &  
$2.8 \;(3.3\!\pm\!2.2)\;\langle0.9,7.5\rangle$ \\ 
&accelerating & &
$246 \;(257\!\pm\!175)\; \langle87,797\rangle$ &
$21 \;(18\!\pm\!7)\; \langle9,32\rangle$ &  
not defined\\ 
%\hline
\multicolumn{2}{c}{\Ha\ DFs}&
      --  &
$136 \;(146\!\pm\!56)\; \langle40,320\rangle$  &
$18 \;(18\!\pm\!6)\; \langle8,35\rangle$ &
$4.2 \;(4.8\!\pm\!1.4)\; \langle2,10.8\rangle$                            \\ 
\hline
 \end{tabular}}
\par
 \medskip{The first
  number of each entry is the median value, followed by the mean with
  standard deviation (between parentheses) and the range (between
  angle brackets). The bottom row shows comparable determinations for
  \Ha\ DFs from \citet{DePontieuetal2007a}.}
\end{table}