\begin{table}%t2
\caption{\label{parameters}Parameters adopted in the radio halo simulation.}                   
%\centering
\par
\begin{tabular}{c c c }    
\hline\hline       
    Parameter     & Value                    & Description          \\ 
\hline                        
  $\langle B_0\rangle$           &{\it free}        & magnetic field strength at the cluster center\\
  $\eta$          &0.47                       & magnetic field radial decrease, $\langle B(r)\rangle=\langle B_0\rangle\left(\frac{n_{\rm e}(r)}{n_{\rm e}(0)}\right)^{\eta}$\\
  $n$             &11/3                      & magnetic field power spectrum index, $|B_k|^2 \propto k^{-n}$\\
  $\Lambda_{\rm min}$ &4~kpc                      & minimum scale of fluctuation, $\Lambda_{\rm min}=2\pi/k_{\rm max}$\\
  $\Lambda_{\rm max}$ &{\it free}                       & maximum scale of fluctuation, $\Lambda_{\rm max}=2\pi/k_{\rm min}$\\
  $\gamma_{\rm min}$  &100                       & minimum relativistic electron Lorentz factor\\
  $\gamma_{\rm max}$  &$+\infty$                  & maximum relativistic electron Lorentz factor\\
  $\delta$       &3                          & power-law index of the energy spectrum of the relativistic electrons \\
\par
\hline                                 
\end{tabular}
\vspace*{2.5mm}
\end{table}