\begin{table}%t2
      \caption{\label{EffBeam}Mesospheric spot parameters for a 40~cm launch telescope under standard conditions ($P=20$~W, $\zeta=30^\circ$)}
           
         \begin{tabular}{llllll}
            \hline\hline
            \noalign{\smallskip}
            Seeing ($''$)   &  {\rm WFE\ (nm)}  & $I_{P/2}$\ {\rm (W/m}$^2$) &
 {\it FWHM}$_{\rm eff}$\  {\rm (cm)} & $d$\ {\rm (cm)}\\
             \hline
            0.6     & 70  & 79.1  & 30.0 & 22.5 \\   
0.6     & 100 & 59.1  & 34.7 & 24.3 \\   
1.0	& 70  & 43.5  & 40.4 & 23.8 \\   
1.0	& 100 & 33.5  & 46.1 & 26.1 \\   
            \hline
         \end{tabular}
   \end{table}