Experimental spectra at five nominal electron beam energies from 9.21 keV to 18.00 keV. For easier visual identification of the major components of He-like Fe XXV complexes and H-like Fe XXVI Lyα lines, the inset spectra show the same experimental spectra with the photon energy range between 6500 eV and 7050 eV. In the inset spectra of 18.00 keV, the strongest resonance He-like Fe XXV w and the H-like Fe XXVI Lyα lines are indicated.