\begin{table}%t2
%\centering
\par
\caption{\label{t2}Journal of Observations. Ond\v{r}ejov: emission line equivalent widths~(\AA).}
{\small \begin{tabular}{cccc}
\hline\hline
\noalign{\smallskip}
JD & H$\alpha$ & He~I & O~VI  \\
  2~450~000+  &   Wide    & 6678 & 6825 \\
\hline
 3145 &       76.1 &       1.26 &       --- \\
      3153 &       72.6 &       1.39 &       5.6 \\
      3454 &       77.7 &       1.06 &       --- \\
      4203 &       100.4 &       2.62 &       7.6 \\
      4217 &       106.4 &       2.51 &       8.1 \\
      4237 &       115.5 &       2.98 &       10.1 \\
      4266 &       136.3 &       3.34 &       11.0 \\
      4364 &       109.7 &       2.57 &       7.2 \\
       4557 &       124.1&      0.88 &       4.9 \\
      4595 &       91.4 &      0.96 &       --- \\
      4603 &       90.9 &      0.92 &       --- \\
      4614 &       83.6 &       1.11 &       --- \\
      4623 &       73.1 &      0.97 &       --- \\
      4627 &       78.0 &       1.02 &       3.9 \\
      4639 &       72.1 &      0.90 &       4.3 \\
      4645 &       76.7 &      1.02 &       4.0 \\
      4647 &       66.8 &       1.04 &       4.1 \\ 
      4648 &       75.9 &       1.00 &       --- \\
      4676 & 61.9 & 1.01 &  3.5 \\
      4685 & 50.9 & 1.03 & 3.7 \\
      4703 & 45.6 & 0.81 & 3.5 \\
      4718 & 41.1 & 0.85 & --- \\
      4761 & 41.1 & 1.04 & --- \\
      4924 & 65.9 & 1.80 & 4.7 \\
      5051 & 47.6 & 0.96 & --- \\
\hline
\end{tabular}}
\end{table}