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&&\enskip Machine \enskip
&&\enskip Time (sec) \enskip
&&\enskip Efficiency \enskip 
&\cr
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\tablerule
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%  Machine     Time    efficiency
%
&& Ncube-1 &&  4.45  &&  0.79  &\cr
&& Symult  &&  1.39  &&  0.79  &\cr
&& Meiko   &&  1.23  &&  0.72  &\cr
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\smallskip
\centerline{Table 4}
\centerline{Timings and efficiencies for one sweep of a $512^2$ lattice 
at $\beta_c$ using 32 processors.}
