Contribution to the average X-ray profile of filaments due to galaxy clusters and point sources. Upper: average radial X-ray profiles of filaments at 0.6−2.3 keV with different sizes for the cluster masks, No cluster mask (blue), 1 × R₅₀₀ (magenta), 2 × R₅₀₀ (green), and 3 × R₅₀₀ (black). Lower: average radial X-ray profiles of filaments at 0.6−2.3 keV with different sizes for the point-source masks. No mask (blue), 15 arcsec (magenta), 30 arcsec (black), and 45 arcsec (green).