\begin{table}%t2
  \caption{Dumping factors due to the precession of the SPOrt~orbit. The cases of thermal behaviour
  synchronous with the Sun illumination with~$K=1$ 
  ($D^1_{\rm pr}$), $K=10$ ($D^{10}_{\rm pr}$) and $K=30$ 
  ($D^{30}_{\rm pr}$) are displayed. The asynchronous case~($D^{\rm asy}_{\rm pr}$) is shown as well.}\label{precDprTab}
%\centering
\par
  \begin{tabular}{@{}cccccc@{}}
     \hline  \hline
     Lifetime    & $N_{\rm pr}$ & $D^1_{\rm pr}$ & 
                          $D^{10}_{\rm pr}$ & $D^{30}_{\rm pr}$ 
                          &  $D^{\rm asy}_{\rm pr}$ \\ 
     $[$months$]$    & & & & &  \\ 
     \hline 
     12 &  5  & 0.046  & 0.745 & 0.201 &   0.200\\
     18 &  8  & 0.220  & 0.416 & 0.002 &   0.125\\
     24 &  10 & 0.046  & 0.191 & 0.141 &   0.100\\
     30 &  13 & 0.135  & 0.079 & 0.078 &   0.077\\
     36 &  15 & 0.045  & 0.183 & 0.065 &   0.067\\
     \hline
\end{tabular}
\end{table}