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            pegpwrlw: power law, pegged normalization

A power law with pegged normalization.

A(E) = KE^-alpha

where :

par1 = alpha

photon index of power law (dimensionless)

par2

lower peg energy range

par3

upper peg energy range

norm

flux (in units of 10–12 erg cm–2s-1 over the energy par2par3).
If .par2 = par3, it is the flux in mJy at par2