Spatial distribution of 2dF galaxies around the H2356-309 sight line (yellow line) projected at two orthogonal directions (upper and lower panels) at the distance range covering SW and PC structures. The coordinates refer to the CMB rest frame. The galaxies belonging to filamentary environments are denoted with plus signs, while other galaxies are denoted with crosses. The filament spines are indicated with green lines. The relative LD level at each radii is denoted with the blue line. The red parts of the sight line highlight the radial ranges of the luminosity density profiles analysed in this work (see Fig. 8).