\begin{table}
  \caption{The five main eigenvalules of the correlation matrix derived
    with the bootstrap resampling of galaxies (first column)
    and subvolumes (Col.~2), and from the ensemble variance
    of the 24 mocks (Col.~3).}
  \label{tab:eigencorr}
  %\centerline
{
  \begin{tabular}{lccc}
    \hline\hline
  Eigenvalue &\multicolumn{2}{c}{Bootstrap} &    Mocks   \\
  \cline{2-3}
             &    Galaxies  &     Volumes   & catalogues \\
\hline
$\lambda_1$  &     3.87784  &     8.28193   &   11.82062 \\
$\lambda_2$  &     1.95834  &     2.17866   &  \ 0.15708 \\
$\lambda_3$  &     1.36841  &     0.71635   &  \ 0.01794 \\
$\lambda_4$  &     1.11316  &     0.38252   &  \ 0.00436 \\
$\lambda_5$  &     0.91683  &     0.20340   &  \ 0.00000 \\
    \hline\\
      \end{tabular}}
For the two latest cases, each mock sample is used in turn as ``data'' and the reported eigenvalues are the
    obtained as the average over the 24 mocks.
\end{table}