\begin{table}%t3
%\centering
\par
\caption{Means and standard deviations of log-normal distributions
  fitted to normalised halo concentration distributions for four
  different halo-concentration prescriptions in the eight different
  cosmological models.\label{tab:2}}
\begin{tabular}{lrrrrrrrr}
\hline\hline
model & \multicolumn{4}{c}{mean} & \multicolumn{4}{c}{$\sigma$} \\
      & NFW & B & ENS & poly & NFW & B & ENS & poly \\
\hline
$\Lambda$CDM  & 0.91 & 1.04 & 1.05 & 1.00 & 0.23 & 0.22 & 0.22 & 0.21 \\
Ratra-Peebles & 0.93 & 1.01 & 1.03 & 1.00 & 0.23 & 0.22 & 0.22 & 0.21 \\
Ratra-Peebles & 0.90 & 1.00 & 1.02 & 1.00 & 0.23 & 0.22 & 0.22 & 0.22 \\
SUGRA         & 0.95 & 1.02 & 0.98 & 1.00 & 0.24 & 0.23 & 0.23 & 0.22 \\
SUGRA         & 0.92 & 1.02 & 0.98 & 1.00 & 0.25 & 0.24 & 0.24 & 0.23 \\
OCDM          & 0.99 & 1.10 & 0.91 & 1.00 & 0.25 & 0.24 & 0.23 & 0.23 \\
$w=-0.6$      & 0.95 & 1.00 & 1.01 & 1.00 & 0.23 & 0.23 & 0.22 & 0.22 \\
$w=-0.6$      & 0.92 & 0.99 & 1.00 & 1.00 & 0.24 & 0.23 & 0.23 & 0.22 \\
combined      & 0.93 & 1.02 & 1.00 & 1.00 & 0.24 & 0.23 & 0.23 & 0.22 \\
\hline
\end{tabular}
\end{table}