Redshift distribution of the spectrophotometric sample in the region including the XLSSsC N01 supercluster. The centroid redshift of the supercluster is represented with a black dashed line in both panels. Left panel: whole spectroscopic sample (blue histogram), low-density field galaxies (grey distribution), galaxies in the high-density field (green distribution), and galaxies classified as virial and outer members (dark orange and black histogram, respectively). Right panel: zoom in on the virial and outer members, with the same colours used in the left panel (see Sect. 3 for details about the definition of different environments).