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\begin{document}

  \begin{table}
\begin{center}
    \begin{tabular}{|c|l|l|c|} \hline
   {\bf Temperature} & $Vomin$ & $Vomax$ & {\bf Voltage Swing} = $Vomax -
Vomin$ \\ \hline \hline
      $253^\circ$K & 3.27 volts  & -6.71 volts &  9.9 volts \\ \hline
      $353^\circ$K & 3.28 volts  & -6.44 volts &  9.7 volts \\ \hline
    \end{tabular}
   \caption{Maximum Output Voltages}
   \label{vmax}
\end{center}
  \end{table}

\end{document}
