\begin{table}%t2
%\centering
\par
\caption{\label{efold}Reduction in maximum surface density, $\delta\Sigma(\%)$ found for various AV prescriptions in the ring spreading test.}
\begin{tabular}{lcc} 
\hline\hline
\noalign{\smallskip}
$\alpha$ & AV Switch & $\delta\Sigma(\%)$\\
\hline
0.0 	&None 	&0.00	\\
0.1 	&None  	&1.08	\\
0.5 	&None 	&2.18	\\
1.0 	&None 	&3.39	\\
\hline
1.0 	&BS 	&0.72	\\
1.0 	&TDV 	&0.92	\\
1.0 	&${\cal NK}$	&0.00	\\
\hline
\end{tabular}
\end{table}