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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}](img393.png)
where:
| par1 |  , threshold energy |
| par2 |  , plasma temperature (keV) |
| norm |  , photons/cm /s in the line |