Filament properties. Left panel: angular area covered by the entire segments (filaments) as a function of the corresponding Lyα flux. The group IDs are labeled and displayed as green filled circles with radii proportional to the total flux S/N. The dotted horizontal line and the blue diagonal line show respectively the 300 arcsec² area limit and a constant surface brightness of 5 × 10⁻²⁰ erg s⁻¹ cm⁻² arcsec⁻². Central panel: same as left panel for the diffuse Lyα emission (diffuse area). The filled circles are colored according to the detection confidence in blue and red for low and high confidence, respectively (see Sect. 4.5). Right panel: total luminosity of diffuse Lyα in filaments (filled circle symbols in red for high confidence, in blue for low confidence) compared with the luminosity of the compact Lyα emission (black open circles) within the same filaments. We note that group 10 has no compact source detected within the filament area.