% matrix for the square lattice 
%
\begin{tabular}{ccc|cccc} 
       &                 &         & \multicolumn{3}{c}{Operators} \\
\qquad & Energy          & Config \qquad\qquad & A  & B & C & \qquad \\ 
\hline
\qquad & $-2J$           &   1    \qquad\qquad & 1  & 1 & 2 & \qquad \\ 
\qquad & $\phantom{-}2J$ &   2    \qquad\qquad & 1  & 0 & 0 & \qquad \\ 
\end{tabular}
