% Autocorrelation times for M^2 for the KBD algorithm
\begin{tabular}{ccccc} 
\qquad & $L$ &  $\tau_{int}(M^2)$  &  $\tau_{exp}(M^2)$ & \qquad \\ 
\hline
\qquad & ~~8 & 0.888(1)\phantom{0} & \phantom{0}0.977(9) & \qquad \\
\qquad & ~16 & 1.035(2)\phantom{0} & \phantom{0}1.85(3)\phantom{0} & \qquad \\
\qquad & ~32 & 1.265(2)\phantom{0} & \phantom{0}3.60(6)\phantom{0} & \qquad \\
\qquad & ~64 & 1.539(4)\phantom{0} & \phantom{0}5.9(1)\phantom{00} & \qquad \\
\qquad & 128 & 1.849(7)\phantom{0} & \phantom{0}9.3(2)\phantom{00} & \qquad \\
\qquad & 256 & 2.188(16)           & 13.7(5)\phantom{00}           & \qquad \\ 
\end{tabular}
