Electron density profile for groups at 10¹³ M_⊙ < M₂₀₀ < 10¹⁴ M_⊙ from this work (blue dashed-dotted curve), Lovisari et al. (2015) (black dashed curve) and Sun et al. (2009) (gray dotted curve), compared with the predictions of the hydrodynamical simulations in the same M₂₀₀ mass bin: Magneticum (pink curve), IllustrisTNG100 (red curve), EAGLE (orange curve), and Simba (green curve). With the exclusion of the Magneticum data provided by Popesso et al. (2025b), the profiles of the simulations are taken from the review of Oppenheimer et al. (2021).