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eplogpar: log-parabolic blazar model with $\nu $F$_{\nu }$ normalization

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

\begin{displaymath}
A(E) = 10^{-\beta(\log(E/E_p))^2} / E^2
\end{displaymath}

par1 $E_p$, the peak energy in $\nu $F$_{\nu }$
par2 $\beta$, curvature term
norm K, the flux in $\nu $F$_{\nu }$ units at energy $E_p$ keV

See for instance Tramacere et al., 2007 and Tramacere et al., 2009.