If the `file' option is chosen for the spectrum type, you must
provide a text file of the spectrum in your current working
directory. The first line of the text file must be the number of
energies listed in the table. The remaining lines are the energy
channel (in eV) and the flux in units of photons cm s
erg
or
erg cm
s
erg
(see next subsection). Note that XSTAR will
appropriately renormalize the luminosity. Also, be aware
that small numbers (less than 1.e-30, say), may result
in undesired results owing to the limitations of many machines
in the range of exponents. Again, remember that it is not
necessary to use actual physical units in specifying the input spectrum
(except to distinguish between photon and energy fluxes)
since the entire spectrum is renormalized to conform to the
luminosity specified.