\begin{table}%t2
    \caption {\label{tab:2}The best-fit parameters and their $1$-$\sigma$ errors for
    the log-normal distribution used to fit the column density
    probability shown in Fig.~\ref{fig:11} (see Eq.~(\ref{eq:11}) for the
    meaning of the various quantities).}
   %\centerline
 {\tiny
    \begin{tabular}{cccc}
    \hline\hline
      Center $A_0$ & Scale $A_1$ & Dispersion $\sigma$ & Normalization $a$ \\
      \hline
      $-0.058 \pm 0.006$ & $0.134 \pm 0.006$ & $0.660 \pm 0.010$ & $2314
      \pm 81$\\
      \hline
    \end{tabular}
  }
     \end{table}