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expfac: exponential modification
An exponential modification of a spectrum.
![$\displaystyle M(E) = \begin{array}{ll}
1+Aexp(-fE) & E > E_c\\ [.2cm]1 & E < E_c
\end{array}$](img467.svg)
par1= |
amplitude of effect |
par2= |
exponential factor |
par3= |
start energy of modification |