Super-exponential cutoff absorption model
useful for fitting gamma-ray spectra of pulsars (see eg Nel & de Jager 1995).
par1 = Ecut, characteristic energy (keV)
Caveat : the absorption for an energy bin is calculated as the arithmetic mean of the function value at the start and end energies of the bin. If the energy bins are large this can be inaccurate and the xspec energies command should be used to define a finer energy grid on which to calculate the model.
Keith Arnaud, Lab. for High Energy Astrophysics, NASA/Goddard Space Flight Center
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