\begin{table}%t2
\caption{Comparison of {\sc hfr} K$\alpha_{2}$/K$\alpha_{1}$ ratios
for Fe ions ($18\leq N\leq 25$) with experiment and previous theoretical
estimates.}
\label{table2}
%\centerline
{
\begin{tabular}{llllll}
\hline\hline
$N$ & Ion & HFR1$^{{a}}$ & HFR2 $^{{b}}$ &
Expt.  & Theory \\
\hline
18 & Fe~{\sc ix}   & 0.7000 & 0.5912 &          &  \\
19 & Fe~{\sc viii} & 0.5780 & 0.6015 &          &  \\
20 & Fe~{\sc vii}  & 0.4541 & 0.5821 &          &  \\
21 & Fe~{\sc vi}   & 0.5545 & 0.5538 &          &  \\
22 & Fe~{\sc v}    & 0.5852 & 0.5346 &          &  \\
23 & Fe~{\sc iv}   & 0.4426 & 0.5143 &          &  \\
24 & Fe~{\sc iii}  & 0.4438 & 0.5032 &          &  \\
25 & Fe~{\sc ii}   & 0.4476 & 0.4969 & 0.51(2)$^{{c}}$   & 0.5107$^{{g}}$ \\
   &               &        &        & 0.507(10)$^{{d}}$ & \\
   &               &        &        & 0.506$^{{e}}$     & \\
   &               &        &        & 0.4998$^{{f}}$    & \\
\hline
\end{tabular}}
\medskip
$^{{a}}$ Includes only the decay lines from the
K-vacancy levels listed in Table~3.\\
$^{{b}}$ Includes all the decay lines from the
$[{\rm 1s}]({\rm 3d+4s})^{M+1}$ complex.\\
$^{{c}}$ \citet{holz97}.\\
$^{{d}}$ \citet{mcg71}.\\
$^{{e}}$ \citet{sal70}.\\
$^{{f}}$ \citet{wil33}.\\
$^{{g}}$ \citet{sco74}.
\end{table}