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            bknpower:  broken power law

A broken power law.

A(E) =

KE^-gamma_1                     E £ Ebreak

KE_break^(gamma_2-gamma_1)*(E/1keV)^-gamma_2              E ³ Ebreak

where:

par1 =gamma_1

power law photon index for E < Ebreak

par2=Ebreak

break point for the energy in keV

par3=gamma_2

power law photon index for E > Ebreak

norm=K

photons keV-1cm-2s-1 at 1 keV}