\begin{table}%t1a 
%\centering
\par
\caption{\label{t1a}Journal of Observations. Loiano: He~I/II and O~VI Raman emission line equivalent widths~(\AA).}
{\small
\begin{tabular}{cccccc}
\hline\hline
\noalign{\smallskip}
JD & He~II & He~I  & O~VI & O~VI & He~I  \\
2~450~000+  & 4686      &   6678  &    6825  & 7080 & 7065 \\
\hline
   4159.6 &     20.9   & 3.14 &        6.5 &      --- & --- \\
       4172.7 &    23.4 &    3.38 &        7.9 &       --- & --- \\
       4182.5 &     24.9 &   2.93 &        7.9 &       --- & --- \\
       4202.6 &    24.9 &    3.36 &        8.3 &       --- & --- \\
       4208.6 &     22.4 &   3.14 &        7.6 &       --- & --- \\
       4215.5 &    24.9 &    3.32 &        8.7 &      --- & --- \\
       4235.5 &     28.2 &   3.72 &        10.4 &       --- & --- \\
       4251.5 &    24.9 &    3.81 &        10.4 &       --- & --- \\
       4279.4 &   28.6 &     3.93 &        12.0 &       --- & --- \\
       4293.4 &     28.8 &   4.36 &        11.9 &      --- & --- \\
       4307.3 &    29.8 &    3.93 &        12.0 &      --- & --- \\
       4329.3 &     27.3 &  3.75 &        9.7  &       --- & --- \\
       4357.3 &   24.0 &     3.46 &        7.8 &      --- & --- \\
    \hline
       4008.3 &  --- &      4.20 &       $\le$0.2 &      --- & --- \\
       4033.2 &   --- &     3.81 &        2.4&     --- & --- \\
       4039.3 &    --- &    3.38 &        2.7 &       --- & --- \\
       4049.2 &    --- &    3.54 &        4.2 &       ---- & ---  \\
\hline
       4008.3 &   --- &     4.18 &       $\le$0.6 &      $\le$ 0.2 &       4.18 \\
       4033.2 &   --- &     3.50 &        2.0 &       0.7 &       3.69 \\
       4039.3 &  ---&       3.15 &        2.8 &       0.8 &       3.25 \\
       4049.2 &   --- &     3.34 &        4.3 &        1.6 &       3.49 \\
       4159.6 &     --- &   2.93 &        6.3 &        3.3 &       3.29 \\
       4172.7 &    --- &    3.22 &        7.8 &        3.5 &       3.47 \\
       4182.5 &    --- &    3.23 &        8.5 &        4.2 &       3.45 \\
       4202.6 &    --- &    3.53 &        8.1 &        3.9 &       3.36 \\
       4208.6 &    --- &    3.13 &        7.86 &        3.6 &       3.53 \\
       4215.5 &    --- &    3.16 &        8.8 &        4.0 &       3.48 \\
       4235.5 &     --- &   3.78 &        10.4 &        4.5 &       3.89 \\
       4251.5 &    --- &     3.81 &        10.9 &        4.5 &       4.06 \\
       4279.4 &    --- &    4.05 &        12.1 &        4.7  &       4.57 \\
       4293.4 &    --- &    4.15 &        12.0 &        4.7 &       4.53 \\
       4307.4 &   --- &     4.05 &        13.0 &        4.5 &       4.48 \\
       4329.3 &    --- &    3.81 &        10.4 &        4.0 &       4.08 \\
       4357.3 &   --- &     3.51 &        8.2 &        3.7 &       3.28 \\
\hline
\end{tabular}}
\end{table}