redge: emission, recombination edge

Recombination edge emission.


\begin{displaymath}
A(E) = \left\{ \begin{array}{ll}
0 & \mbox{if $E < E_c$} \\...
...c)\over{T_p}}] & \mbox{if $E >= E_c$} \\
\end{array} \right.
\end{displaymath}

where:

par1 $E_c$, threshold energy
par2 $T_p$, plasma temperature (keV)
norm $K$, photons/cm$^2$/s in the line