4.1.16. File: model read from a file¶
This model reads a spectrum from a file. The user inputs a spectrum at energy bins (). The file containing the spectrum should have the follwing format:
second line: ,
third line: ,
last line: ,
Here is the energy of a photon in keV, and is the spectrum in units of photons . All energies must be positive, and the grid must be monotonically increasing (two subsequent energies may not have the same value). Also, the spectrum must be strictly positive (i.e. is not allowed).
SPEX then calculates the spectrum by linear interpolation in the plane (this is why fluxes must be positive). For and however, the spectrum is put to zero. Finally, the spectrum is multiplied by the scale factor prescribed by the user.
The parameters of the model are:
norm: Normalisation factor . Default value: 1.
file: The file name of the file containing the spectrum