\begin{table}%t4
%\centering
\par
\caption{\label{tab:transition}Labels of first and last de-excitation transitions from a given level (as given in Table~\ref{tab:energie}). This table is the key for reading the figures giving ratios of rate coefficients as a function of transitions labels.}
\small \begin{tabular}{ccccccccc}
\hline\hline\noalign{\smallskip}
Level & First & Last & Level & First & Last & Level & First & Last \\
\hline\noalign{\smallskip}
 2 & 1 & 1 & 17  & 121 & 136 & 32 & 466 & 496\\
 3 & 2 & 3 & 18 & 137  & 153 & 33  & 497 & 528\\
 4 & 4&  6& 19 & 154 & 171 & 34  & 529 & 561\\
 5 & 7& 10& 20 & 172 & 190 & 35  & 562 & 595\\
 6 & 11& 15 & 21 & 191 & 210 & 36  & 596 & 630\\
 7 & 16 &21 & 22 & 211 & 231 & 37  & 631 & 666\\
 8 & 22 & 28& 23 & 232 & 253 & 38  & 667 & 703\\
 9 & 29 & 36 & 24 & 254 & 276 &  39  & 704 & 741\\
 10 &37 & 45& 25 & 277 & 300 & 40  & 742 & 780 \\
 11 &46 & 55 & 26 & 301 & 325 &  41  & 781 & 820\\
 12 &56 & 66 & 27 & 325 & 351 & 42  & 821 & 861 \\
 13 &67 & 78 & 28 & 352 & 378 & 43  & 862 & 903 \\
 14 &79 & 91 & 29 & 379 & 406 & 44  & 904 & 946\\
 15 &92 & 105& 30 & 407 & 435 & 45  & 947 & 990 \\
 16 &106 & 120& 31 & 436 & 465 & &   &  \\
\hline
\end{tabular}
\end{table}