Normalised distribution of the distance (in Mpc) for neighbours with Δν ≤ ,500 km s^-1 within 1 Mpc around galaxies in the comparison samples. Upper panel: red solid histogram represents neighbours around our isolated galaxies is zero by definition. The black dashed and black dash-dotted histograms correspond to the distributions for neighbours around galaxies in the UNAM-KIAS and the CIG, respectively. Middle panel: distributions for neighbours around galaxies in the KPG (black dash-dotted histogram) and the catalogue of Patton & Atfield (2008; black dashed histogram). The green solid histogram corresponds to the distribution of the distance for the B galaxies in our isolated pairs. Lower panel: distributions for neighbours around galaxies in the KTG (black dash-dotted histogram) and the catalogue of O’Mill et al. (2012; black dashed histogram). The blue solid histogram corresponds to the distribution of the distance for the B and C galaxies in our isolated triplets.