Top panels and bottom left panel: Comparison of the PHOX spectrum with the resulting stacked spectrum for the mock sample across different mass bins. The red line represents the total PHOX X-ray spectrum, along with its 3σ error range. The black, blue, and green lines correspond to the average PHOX X-ray spectra for the ICM, AGN, and X-ray binary (XRB) components, respectively. Black data points indicate the stacked mock X-ray spectrum, equivalent to eRASS:4 observations, after accounting for the eROSITA response curve. The vertical axis corresponds to the fraction of photons within each energy bin from each component relative to the total counts in the 0.5–2 keV energy band. Bottom right panel: Contribution of different spectral components to the total spectrum in the 0.5–2 keV range, shown after masking of point sources from the eRASS1 catalog. The black, blue, and green lines represent the IGrM, AGN, and XRB components, respectively.