Gas temperature profiles around filament spines at z = 0 (top) and z = 2 (bottom) for the EAGLE and TNG simulations (shades of purple and red, respectively). Filaments are split by their width as indicated in each panel; darker shades correspond to thicker filaments. For each bin, we show both the mass-weighted profile (thin dashed lines) and the length-weighted one (thick solid lines); see text for details. While temperatures are generally decreasing towards larger radii, there is considerable variation with filament width, weighting method, and at z = 2 also between the two simulations.