\begin{table}%T4
\caption{\label{tab:abbond}Ratios between elemental and iron coronal abundances, relative to
the solar photospheric ratios \citep{Grevesse1992}, derived from RGS data,
using the APED and CHIANTI databases; errors are at 68\% confidence level.
For each element, the number of lines included in the $EM$ reconstruction is
also shown.}
%\centering
\par
\begin{tabular}{lcccc} 
\hline\hline
              &       APED              & No. lines &       CHIANTI          & No. lines \\ \hline
   C          &  $\rm 0.24_{-0.07}^{+0.22}$  &       1       & $\rm 0.35_{-0.12}^{+0.4}$  &       1       \\ \hline
   O          &  $\rm 0.49_{-0.08}^{+0.15}$ &       2       & $\rm 0.41_{-0.06}^{+0.14}$ &       3       \\ \hline
   Ne         &  $\rm 0.78_{-0.3}^{+0.13}$  &       2       & $\rm 0.62_{-0.08}^{+0.23}$  &       2       \\ \hline
   Mg         &  $\rm 1.0_{-0.3}^{+0.4}$    &       2       & $\rm 0.82_{-0.14}^{+0.25}$  &       2       \\ \hline   
   Si         &  $\rm 0.9_{-0.3}^{+0.9}$    &       1       & $\rm 0.85_{-0.27}^{+1.0}$    &       1       \\ \hline
   Fe         &           1             &       27      &            1             &      17      \\ \hline
   Ni         &  $\rm 3.5_{-0.7}^{+2.1}$      &       6       & $\rm 4.6_{-1.0}^{+1.1}$    &       4       \\ \hline
total lines  &                         &      41       &                        &      30       \\ \hline 
\end{tabular}
\end{table}