\begin{table}%t6
\caption{\label{table6}Comparison of Auger rate data sets for
Fe~{\sc xviii}--Fe~{\sc xxiv} in terms of mean ratios.}
%\centering
\par
\begin{tabular}{lrrrrrrr}
\hline\hline\noalign{\smallskip}
\multicolumn{1}{c}{Data sets}&\multicolumn{1}{c}{Fe~{\sc xxiv}}&\multicolumn{1}{c}{Fe~{\sc xxiii}}&\multicolumn{1}{c}{Fe~{\sc xxii}}&
\multicolumn{1}{c}{Fe~{\sc xxi}}&
\multicolumn{1}{c}{Fe~{\sc xx}}&\multicolumn{1}{c}{Fe~{\sc xix}}&\multicolumn{1}{c}{Fe~{\sc xviii}}\\
\noalign{\smallskip}\hline\noalign{\smallskip}
$\overline{R}({\rm AST1,AST2})$& $1.10\pm 0.24$ & 1.11~$\pm$~0.29 & 1.05~$\pm$~0.09 & 1.04~$\pm$~0.03 & 1.04~$\pm$~0.02  & 1.04~$\pm$~0.02 & 1.04 \\
$\overline{R}({\rm BPR1,AST1})$& $0.99\pm 0.14$ & 0.98~$\pm$~0.11 & 0.98~$\pm$~0.04 & 1.00~$\pm$~0.02 & 1.01~$\pm$~0.02  & 1.03~$\pm$~0.01 & 1.06 \\
$\overline{R}({\rm HFR3,AST3})$& $1.68\pm 2.18$ & 1.06~$\pm$~0.25 & 1.00~$\pm$~0.08 & 1.00~$\pm$~0.03 & 1.01~$\pm$~0.02  & 1.03~$\pm$~0.02 & 1.03 \\
$\overline{R}({\rm COR,AST3})$ & $1.06\pm 0.20$ & 1.04~$\pm$~0.27 & 0.99~$\pm$~0.10 & 0.95~$\pm$~0.06 &   &  &  \\
$\overline{R}({\rm SAF,AST3})$ & $1.08\pm 0.15$ & 1.16~$\pm$~0.23 & 1.21~$\pm$~0.27 & 1.28~$\pm$~0.04 &   &  &  \\
$\overline{R}({\rm MCDF,AST3})$& $0.96\pm 0.33$ & 1.02~$\pm$~0.08 & 1.04~$\pm$~0.04 & 1.20~$\pm$~0.19 &   &  &  \\
\hline
\end{tabular}
\end{table}