Resulting X-ray fluxes from electrons of energy E ≤ 40 keV (dashed line) and from electrons of energy E >  40 keV (solid line) separately, for two different high energy cutoff of E_H = 100 keV (top) and E_H = 300 keV (middle). Bottom: X-ray contribution ratio (the X-ray emission from E >  40 keV divided by the X-ray emission from E ≤ 40 keV) versus energy up to 40 keV (vertical grey dotted line), for electron distributions with E_H = 100 keV and E_H = 300 keV. The horizontal black dashed-dot line denotes a ratio of 1.