Thermal, magnetic and velocity profiles along the central axes of average filaments at log (τ) = 0. Clockwise: temperature T, magnetic field strength B, field inclination in the line-of sight γ_LOS (solid lines) and in the local reference frame γ_LRF (dashed lines), and line-of-sight velocity v_LOS. The profiles correspond to the longitudinal cuts denoted by horizontal dashed lines in Fig. 9: center-side NEF (blue), limb-side NEF (green) and CEF (red). Here, the “natural” x-position of the average filament from the CEF case has been reversed and we refer to its outermost footpoint (closest to the quiet Sun) as its “head” and to the innermost one (closest to the umbra) as its “tail”.