\begin{table}%t1
%\centering
\par
\caption{Numbers of neighbours and the related percentile. A percentile is
defined as the value of a given scalar quantity characterizing the fraction of
the distribution that is equal or smaller than that value.}\label{tab:percentile}
\small{\begin{tabular}{rr}
\hline\hline
 $N_{\rm neigh}$ & Percentile \\
\hline
 0   & 1st  \\
 2  & 5th  \\
 4  &10th  \\
 9  &25th  \\
 18  &50th  \\
 35  &75th  \\
 59  &90th  \\
 79  &95th  \\
 127 &99th \\
\hline
\end{tabular}}
\end{table}