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\mediumtext
\begin{table}
\setdec 0.00
\caption{The Poisson ratio defined as the ratio of lateral
contraction to longitudinal expansion for uniaxial stress.
 Experimental values are given for comparison.}
\begin{tabular}{lcclcc}
  &\multicolumn{2}{c}{$\sigma$}& &\multicolumn{2}{c}{$\sigma$}\\
 &Predicted&Observed$^{\rm a}$& &Predicted&Observed$^{\rm a}$\\
\tableline
Cu& \dec 0.48 &\dec 0.36 &Al&\dec 0.47 &\dec 0.33 \\
Ag& \dec 0.48 &\dec 0.37 &Tl&\dec 0.47 &\dec 0.35 \\
Au& \dec 0.48 &\dec 0.36 &Sn&\dec 0.46 &\dec 0.33 \\
Mg& \dec 0.47 &\dec 0.35 &Pb&\dec 0.46 &0.40--0.45 \\
Zn& \dec 0.47 &\dec 0.25 &Pb&\dec 0.49 &\dec 0.43 \\
 & & &K&\dec 0.49 &\dec 0.44 \\
\end{tabular}
\label{table6}
\end{table}
\end{document}
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