Spectral fit of RGS + stacked MOS1 (light blue and green points, upper left panel), RGS + stacked MOS2 (light blue and green points, upper right panel), RGS + stacked pn (light blue and green points, lower left panel), and RGS + all stacked EPIC (light blue, green, violet and black points, lower right panel). Residuals are shown in the bottom panel. The model used for fitting is the combination of cie and the isobaric CF split into three temperature intervals. The model components are represented with different colors and line styles in the plots. Orange lines represent the cie component, and blue lines represent the power law component describing the ICM and AGN, respectively. Magenta, gold, and light green lines represent the three temperature bins (0.5-1, 1-2, and 2-3 keV) components.