Comparison of the bremsstrahlung spectra calculated using the approach outlined in Sect. 3.1 (labeled “CHIANTI”) and the RHESSI SSW tree. Full line denotes the ratio of the purely hydrogen bremsstrahlung, P_{ff   CHIANTI}/P_{ff   RHESSI}, computed using the “CHIANTI” approach and the RHESSI software. Ratios of the bremsstrahlung due to all elements with Z ≦ 30 to the purely hydrogen bremsstrahlung, P_ff/P_ff,H, for the coronal abundances (dashed line) and photospheric abundances (dotted line) computed according to Eqs. (4)–(6) are compared to the multiplicative factor of 1.44 used in the RHESSI SSW (horizontal gray line).