GX13+1 XMM-Newton EPIC pn spectra. Left panel: unfolded spectrum of Obs. 1 in the 4.5–8.1 keV energy range, the data (in black), the total model TBABS*(BBODYRAD+COMPTT+WINDLINE(6.6 KEV))*LGABS*LGABS*LGABS (solid red line), the red-skewed emission line at 6.6 keV (dashed red line), and the continuum components (dashed black and blue lines). The three absorbed Gaussian lines correspond to the narrow He- and H-like K_α and the He-like K_β Fe absorption lines. Right panel: unfolded spectrum of Obs. 2 in the 4.5–8.1 keV energy range, the data (in black), the total model TBABS*(BBODYRAD+COMPTT+WINDLINE(6.6 KEV))*LGABS (solid red line), the red-skewed emission line at 6.6 keV (dashed red line), and the continuum component (dashed black and blue lines). The absorbed Gaussian line corresponds to the narrow H-like K_α Fe absorption line at 7.0 keV.