Density distribution of the direction of plane-normal vectors (minor axis of 3D galaxy distribution) of the galaxies with measured distances within 600 kpc around NGC 253, for 1000 realisations drawn from the distance errors. Shown are supergalactic coordinates, indicating that the best-fit plane aligns closely with the Supergalactic plane. The red symbols indicate the eigenvectors of the tidal tensor at the position of NGC 253, which describe the principal directions of the surrounding cosmic web. The best-fit plane is well aligned with e₁, the axis along which material in the cosmic web is compressed fastest.