\begin{table}%t1
%\centering
\par
\caption {Elements with
their coronal abundances and ionisation potentials at $T \gg 10^8$~K.\label{tab1}}
\begin{tabular}{cccccc}
\hline\hline
\noalign{\smallskip}
Element & $Z$ & $A_z$ & $A_zZ^2$ & $A_zZ^4$ & $V_z = Z^2\chi$ (keV)\\
\hline
H & 1 & 1 & 1 & 1 & 0.0136\\
He & 2 & 0.096 & 0.384 & 1.536 & 0.0544\\
C & 6 & 3.57 $\times$ $10^{-4}$ & 0.013 & 0.463 & 0.490\\
O & 8 & 8.57 $\times$ $10^{-4}$ & 0.055 & 3.511 & 0.870\\
Ne & 10 & 1.07 $\times$ $10^{-4}$ & 0.011 & 1.071 & 1.360\\
Mg & 12 & 1.33  $\times$ $10^{-4}$ & 0.019 & 2.755 & 1.958\\
Si & 14 & 1.27 $\times$ $10^{-4}$ & 0.025 & 4.871 & 2.666\\
S & 16 & 1.61 $\times$ $10^{-5}$ & 0.0041 & 1.053 & 3.482\\
Ca & 20 & 8.50 $\times$ $10^{-6}$ & 0.0034 & 1.360 & 5.440\\
Fe & 26 & 8.61 $\times$ $10^{-5}$ & 0.058 & 39.336 & 9.914\\
Ni & 28 & 6.95 $\times$ $10^{-6}$ & 0.0054 & 4.27 & 10.662\\
\hline
 &  &  & $\Sigma = 1.58$ & $\Sigma = 61.2$ & \\
\hline
\end{tabular}
\end{table}