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Hotabs and hotemis are the coronal analogs of warmabs and photemis. In this case the free parameter determining the ionization is the log of the temperature in units of 10$^4$ K, i.e. logt4=0 corresponds to 10$^4$ K, logt4=3 corresponds to 10$^7$K.

The normalization is the same as for warmabs. The model supplies to xspec the emissivity of the gas, in units of erg cm$^{-3}$ s$^{-1}$, times a factor 10$^{10}$. So the physical meaning of the normalization, $\kappa$, is

\kappa=\frac{{\rm EM}}{4\pi D^2} \times 10^{-10}
\end{displaymath} (8.2)

where EM is the emission measure of the gas in the source (at the temperature used in the fit) and D is the distance to the source.

Tim Kallman 2018-12-14