\begin{table}%t3
\caption{Simulation parameters and results for the HDFN observations. We list SW~parameters, and relative abundances for the two variants of the simulation, as well as model and data line fluxes for O~VII and O~VIII.}\label{HDFN_table}
%\centering
\small
\begin{tabular}{ccccccccc}
\hline \hline
& \multicolumn{4}{c}{\underline{~~ Proton flux step function~~ }} 
	& \multicolumn{4}{c}{\underline{~~ Ion relative abundances~~ }}\\
&\multicolumn{2}{c}{\underline{~~ Simulation 1~~ }} & \multicolumn{2}{c}{\underline{~~ Simulation 2~~ }} 
	& \multicolumn{2}{c}{\underline{~~ HIGH~~ }} & \multicolumn{2}{c}{\underline{~~ LOW ~~ }} \\
&$T_o + \Delta t$ (d)& $f_{\rm SW}$ (SPFU) & $T_o + \Delta t$  (d) & $f_{\rm SW}$ (SPFU) &$\rm  [ O^{7+}~/~O ] $ 
	& $\rm  [ O^{8+}~/~O ] $ & $\rm  [ O^{7+}~/~O ] $ & $\rm  [ O^{8+}~/~O ] $ \\
	\hline 
& (0.5 + 0.5) & 4 & (0.5 + 1.) & 10 & 0.488 & 0.28 & 0.125 & 0.038 \\
 \hline
&&&&&&&& \\[-8pt]
&\multicolumn{8}{c}{\underline{~~ Line flux (LU = photons cm$^{-2}$ s$^{-1}$ sr$^{-1}$)~~ }}\\
 & \multicolumn{2}{c}{\underline{~~ Simulation 1~~ }} & \multicolumn{2}{c}{\underline{~~ Simulation 2~~ }} 
	& \multicolumn{2}{c}{\underline{~~ SCK04~~ }} & \multicolumn{2}{c}{\underline{~~ Data~~ }}\\
 & High & Low & High & Low & \multicolumn{2}{c}{High} & High & Low \\\hline 
O VII & 4.20  & 3.22 & 9.06 & 2.02 & \multicolumn{2}{c}{7.39} & 15.44 & 8.14 \\
O VIII & 1.99 & 1.40 & 5.69 & 1.18 & \multicolumn{2}{c}{6.54} & 8.14 & 1.96 \\
\hline
\end{tabular}
\end{table}