\begin{table}%t1
\caption{\label{my_table}Effective smoothing angles in arcminutes for $w_s$ and $z_s$
  computed from Eq.~(\ref{def_theta_s}) as a function of simulation
  resolution.}
  %\centering
\par
\begin{tabular}{ccc}
\hline\hline\noalign{\smallskip}
  & small-scale smoothing & large-scale smoothing \\
\noalign{\smallskip}\hline\noalign{\smallskip}
  $w_{\rm smooth}$ &
  $\theta_{\rm S}=0.40$ & $\theta_{\rm S}=0.80$ \\
  $z_{\rm smooth}$ &
  $\theta_{\rm S}=0.39$ & $\theta_{\rm S}=0.78$ \\
\noalign{\smallskip}\hline
\end{tabular}
\end{table}