\begin{table}%t3
 \caption{Turbulent viscosity coefficients and $\alpha$-values, based on
    \Eqss{eq:nutkin}{eq:alphamag}.}
  \label{t:viscosity}
\par
  %\centering
\small
    \begin{tabular}{lcccccc}
      \hline \hline
     % &&&&&& \\[-8pt]
        Run & $\nu_{\rm t}^{\rm (mag)}$ &
              $\nu_{\rm t}^{\rm (kin)}$ &
              $\nu_{\rm t}^{\rm (tot)}$ &
              $\alpha_{\rm t}^{\rm (mag)}$ &
              $\alpha_{\rm t}^{\rm (kin)}$ &
              $\alpha_{\rm t}^{\rm (tot)}$ \\
     %  &&&&&& \\[-8pt]       
      \hline
            S3D\_256         & $0.075$ & $0.020$ & $0.095$ &
                               $0.053$ & $0.014$ & $0.067$ \\
            S3D\_512         & $0.107$ & $0.033$ & $0.141$ &
                               $0.076$ & $0.023$ & $0.100$ \\
            S3D\_256\_b3     & $0.042$ & $0.010$ & $0.052$ &
                               $0.030$ & $0.007$ & $0.037$ \\
            S3D\_256\_Lz18   & $0.078$ & $0.017$ & $0.095$ &
                               $0.055$ & $0.012$ & $0.067$ \\
            S3D\_256\_Bz0.03 & $0.096$ & $0.023$ & $0.120$ &
                               $0.068$ & $0.017$ & $0.085$ \\
      \hline
    \end{tabular}
 \end{table}