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notch: absorption line, notch

A notch line absorption. This is model is equivalent to a very saturated absorption line.

$\displaystyle M(E) = \begin{array}{ll} (1-f) & E_L - W/2 < E < E_L + W/2 \\ [.2cm]1 & \mbox{elsewhere} \end{array}$
where

par1=$E_L$ line energy (keV)
par2=W line width (keV)
par3=f covering fraction