\begin{table}%t7
%\centering
\par
\caption{Ground configuration forbidden decay rates. The symbols \vtl\
and \btl\ indicate that the values are different from those of the
present calculations by amounts greater than 30\% and a factor of 2,
respectively.}\label{tbl.forbid-compare} 
\begin{tabular}{llllll}
\hline
\hline
&&Ishikawa \& &&&Mendoza \& \\
Transition &SSTRUCT &Vilkas (2001) &CHIANTI &\citet{huang85}
           &Zeippen (1982)\\
\hline
1--2 &$1.396(+1)$ &$1.385(+1)$
                  &$1.401(+1)$
                  &$1.358(+1)$
                  &$1.39(+1)$ \\
1--3 &$6.373(-3)$ &$2.168(-3)$ \btl
                  &$6.348(-3)$
                  &$6.535(-3)$
                  &$6.32(-3)$  \\
1--4 &$3.247(-3)$ &--
                  &$3.774(-3)$
                  &$8.589(-3)$ \btl
                  &$2.55(-3)$  \\
2--3 &$9.734(+0)$ &$9.586(+0)$
                  &$9.867(+0)$
                  &$1.057(+1)$  
                  &$9.74(+0)$ \\
2--4 &$7.173(+1)$ &--
                  &$6.200(+1)$
                  &$7.548(+1)$
                  &$7.01(+1)$  \\
2--5 &$1.087(+3)$ &--
                  &$9.860(+2)$
                  &$1.168(+3)$
                  &$1.07(+3)$ \\
3--4 &$8.623(+1)$ &--
                  &$7.557(+1)$
                  &$9.642(+1)$
                  &$8.47(+1)$ \\
3--5 &$4.540(+0)$ &--
                  &$3.851(+0)$
                  &$5.019(+0)$
                  &$4.31(+0)$ \\
4--5 &$7.640(+0)$ &--
                  &$7.756(+0)$
                  &$9.250(+0)$
                  &$7.60(+0)$  \\
\hline
\end{tabular}
\end{table}