Red: simulated stacked energy spectrum of SRG/eROSITA from the gas at the cores of the stacked 15 165 filaments. The stacked spectrum is calculated with overdensity = 30, temperature = 0.9 keV, and metallicity = 0.2 Z_⊙ and represented as a red solid curve. The stacked spectrum is also calculated assuming overdensity = 19, temperature = 0.3 keV and metallicity = 0.2 Z_⊙ and shown as a red dashed curve, and overdensity = 19, temperature = 0.1 keV and metallicity = 0.2 Z_⊙ and shown as a dash-dotted curve. Blue: simulated background energy spectrum of SRG/eROSITA based on the model from Merloni et al. (2012).