\begin{table}%T1
\par
%\centering
\par
\caption{Peak population fractions and corresponding temperatures, in
  equilibrium, for the selected transition region ions.}
\label{table1}
\begin{tabular}{ccc}\hline\hline
Ion&$Y_i$&log$_{10}$ $T_{\rm peak}$\\ 
\hline
He~I&1.00&4.0\\
He~II&0.98&4.7\\
C~III&0.86&4.8\\
C~IV&0.34&5.0\\\hline
\end{tabular}
\end{table}