\begin{table}%t5
\caption{\label{tab:acoeff}Coefficients for the fourth-order powerlaw approximation of $\alpha_{\rm pred}$ as a function of $\mathcal{Q}_{\rm pred}$ (see Eq.~(\ref{eq:alphaq})).}
%\centering
\small
\begin{tabular}{c |c c c c c}
  \hline\hline
  \multicolumn{6}{c}{$\alpha_{\rm pred}$ coefficients} \\
  \hline 
  $n$ & 0 & 1 & 2 & 3 & 4 \\ 
  \hline
     $a_n$ & --4.31 & 17.76 & --22.10 & 13.17 & --3.02    \\
     $b_n$ & --17.04 & 74.41 & --116.76 & 84.13 & --23.06  \\
\hline
\end{tabular}
\end{table}