\begin{table}%t1
\caption{Comparison of centroid wavelengths (\AA) for the K$\alpha$ and
K$\beta$ unresolved transition arrays in Fe ions with
$17\leq N\leq 25$. The {\sc hfr} wavelengths have been
weighted with the fluorescence yields. Experimental wavelengths for
Fe~{\sc x} ($N=17$) are from \citet{dec95} and for solid-state iron
from \citet{holz97}.}
\label{table1}
%\centering
\par
\begin{tabular}{llllll}
\hline\hline
&\multicolumn{2}{c}{HFR} &&\multicolumn{2}{c}{Expt}\\
\cline{2-3}\cline{5-6}
$N$ & K$\alpha$ & K$\beta$     && K$\alpha$   & K$\beta$ \\
\hline
 17 & 1.9369 & 1.7488 && 1.9388(5)   &            \\
    & 1.9407 & 1.7493 && 1.9413(5)   &            \\
 18 & 1.9366 & 1.7511 &&             &            \\
    & 1.9402 &        &&             &            \\
 19 & 1.9364 & 1.7527 &&             &            \\
    & 1.9403 &        &&             &            \\
 20 & 1.9362 & 1.7540 &&             &            \\
    & 1.9405 &        &&             &            \\
 21 & 1.9360 & 1.7557 &&             &            \\
    & 1.9404 &        &&             &            \\
 22 & 1.9357 & 1.7566 &&             &            \\
    & 1.9400 &        &&             &            \\
 23 & 1.9355 & 1.7565 &&             &            \\
    & 1.9397 &        &&             &            \\
 24 & 1.9356 & 1.7565 &&             &            \\
    & 1.9398 &        &&             &            \\
 25 & 1.9356 & 1.7566 && 1.936041(3) & 1.756604(4)\\
    & 1.9398 &        && 1.939973(3) &            \\
\hline
\end{tabular}
\end{table}