\begin{table}%t13
%\centering
\par
\caption{\label{tab_gf_kr}Comparison of the weighted oscillator strength $gf$ between the AS  and other calculations for Kr$^{26+}$.} 
\par
 \begin{tabular}{cccccc}
\hline\hline\noalign{\smallskip}
$i-j$          &   \multicolumn{2}{c}{AS} &  {\rm MCDF\tablefootmark{a}} &  {\rm RFG00\tablefootmark{b}} &   {\rm ZSC87}\tablefootmark{c}   \\
             &   $gf_L$   &$gf_V/gf_L$      &             & &  \\
\hline\noalign{\smallskip}
    1--3  & 1.34$^{-1}$$^d$ & 0.83 &  1.34$^{-1}$ &              & 1.34$^{-1}$ \\
    1--7  & 7.86$^{-2}$ & 0.96 &  8.45$^{-2}$ &              & 8.45$^{-2}$ \\
    1--17  & 4.45$^{-3}$ & 0.96 &  6.41$^{-3}$ &  7.79$^{-3}$ & 6.00$^{-3}$ \\
    1--23  & 1.53$^{+0}$ & 1.00 &  1.55$^{+0}$ &  1.54$^{+0}$ & 1.55$^{+0}$ \\
    1--27  & 1.90$^{+0}$ & 1.00 &  1.93$^{+0}$ &  1.94$^{+0}$ & 2.09$^{+0}$ \\
    1--31  & 8.90$^{-2}$ & 1.01 &  8.97$^{-2}$ &  8.75$^{-2}$ & 9.70$^{-2}$ \\
    1--33  & 3.12$^{-1}$ & 1.06 &  3.05$^{-1}$ &  3.05$^{-1}$ & 3.78$^{-1}$ \\
    1--39  & 2.38$^{-2}$ & 0.69 &  2.48$^{-2}$ &  2.47$^{-2}$ & 2.30$^{-2}$ \\
    1--47  & 2.44$^{-3}$ & 0.93 &  3.26$^{-3}$ &              & 3.90$^{-2}$ \\
    1--54  & 6.88$^{-2}$ & 0.95 &  7.94$^{-2}$ &  6.80$^{-2}$ & 5.00$^{-3}$ \\
    1--55  & 4.20$^{-1}$ & 0.97 &  4.29$^{-1}$ &  4.34$^{-2}$ & 4.12$^{-1}$ \\
    1--71  & 3.15$^{-1}$ & 0.99 &  3.38$^{-1}$ &  3.30$^{-1}$ & 3.11$^{-1}$ \\
    1--79  & 2.19$^{-2}$ & 0.69 &  2.97$^{-2}$ &  3.33$^{-2}$ &             \\
    1--81  & 2.15$^{-2}$ & 0.98 &  1.77$^{-2}$ &  1.30$^{-2}$ &             \\
    1--83  & 1.17$^{-1}$ & 0.96 &  1.20$^{-1}$ &  1.17$^{-1}$ &             \\
    1--97  & 2.03$^{-1}$ & 0.95 &  2.24$^{-1}$ &  2.33$^{-1}$ &             \\
    1--123  & 1.58$^{-3}$ & 0.91 &  2.50$^{-3}$ &              &             \\
    1--131  & 1.11$^{-1}$ & 0.99 &  1.31$^{-1}$ &  1.37$^{-1}$ &             \\
   \hline
 \end{tabular}
\tablefoot{ Index number corresponds to that in Table~\ref{tab_energy_kr}.
\tablefoottext{a}{Corresponds to the work of %Griffin et~al. (
\citet{GBM08}.} 
\tablefoottext{b}{RFG00 refers to the calculation of %Rice et~al. (
\citet{RFG00}.} 
\tablefoottext{c}{ZSC87 refers to the calculation of %Zhang et~al. (
\citet{ZSC87}.} 
\tablefoottext{d}{$x^y$ denotes $x\times10^y$.}}
 \end{table}