eplogpar: log-parabolic blazar model with F normalization

eplogpar is a power-law with an index which varies with energy as a log parabola.

par1 | , the peak energy in F |

par2 | , curvature term |

norm | K, the flux in F units at energy keV |

See for instance Tramacere et
al. (2007)
and Tramacere et
al. (2009).