\begin{table}%t4
\caption{Radial velocities of the  IUE emission lines (in units of km~s$^{-1}$).}
\label{rvel_tab}
\small
%\centerline
{\begin{tabular}{cccccccccccc}
\hline\hline 
MJD & $\phi$ & \ion{N}{v} & \ion{Si}{iv} & \ion{O}{iv}] & \ion{N}{iv}] &
\ion{C}{iv}& \ion{He}{ii} & \ion{O}{iii}] & \ion{N}{iii}] & \ion{Si}{iii}] & \ion{C}{iii}]  \\ 
  &  & 1238/42 & 1394/1403 & 1400/01/05 & 1486 & 1548/50 & 1640 & 1660/66 &
1749/50/52/54 & 1892 & 1909 \\
\hline
44157 & 0.718 & 37/35: & 36/42 & 39/.../44 & 26 & 43/42 & 19 & 20/20 & 19/14/8/... & 21 & {\it 15} \\
44401 & 0.003 & 47/... & 38/41 & .../.../... & 19 & 44/40 & 14 & 26/14 & 
9/10/13/...  & 12 & {\it 10} \\
44719 & 0.375 & 27:/... & 36:/32: & .../.../... & ~8 & 39/35 & --6 & 6/7 &
$-9:$/10/.../... & 11 & ~2 \\
44831 & 0.506 & 19/22 & 26/... & .../.../... &  ~4 &  40/39  & --2 & 11/7  & .../ 4/.../... & 10 & 4 \\
45294 & 0.046 & 27/20 & 23/27 & .../.../... & ~2 & {\it 38/29} & {\it 2} & --4/{\it 0} & .../--8/.../... & {\it --5} & {\it --1} \\
47786 & 0.959 & .../... & .../... & .../.../... & ~1 & 27/25 & ~3 & 3/3 & .../3/.../5 & ~6 & ~4 \\
48812 & 0.159 & 21:/21: & .../... & .../.../... & --3 &  33/ 34 & --17 & 3/3  & .../ 1/.../... & ~8 & ~0 \\
49486 & 0.946 & 15:/24:  & ~9:/27: & .../.../... & ~7 & 32/29 & 10 & .../2 & .../4/.../... & ~1 & ~9 \\
49520 & 0.986 & 21/... & 22/... & .../.../12 & --3 & {\it 29}/22 & {\it ~2} & .../--8 & .../--3/.../... & --4 & {\it --2} \\
49676 & 0.168 & 33/31 & 42/35 & --1/.../4 & ~2 & 35/35 & --12 & 1/2 & 4/3/--1/7 & ~7&{\it ~3} \\
49827 & 0.345 & 16/17 & 25/19 & 2/7/13 & ~2 & {\it 31/27} & {\it --23} & 0/6 & 6/4/0/1 & {\it  ~8} & {\it  ~3} \\
49970 & 0.513 & 33/29 & 35/31 & 14/.../31 & 17 & {\it 39/34} & {\it --4} & 18/16 &
17/21/11/19 & {\it 25} & {\it 22}\\
\hline \end{tabular}}
\medskip
"...'' -- too noisy; ":'' -- uncertain; for saturated lines the radial velocities (itallic) were obtained by fitting their wings.
\end{table}