Distribution of galaxy groups in SCl 027 in Cartesian coordinates. Upper panel: yz, and lower panel: yx plane. Filled circles of different colours correspond to galaxy groups from different components. The size of the symbols is proportional to the size of the groups in the sky plane. Ellipses are 1σ covariance ellipses of components as found by normal mixture modelling. Numbers show order numbers of components from Table 3 and Abell numbers of rich clusters in the high-density cores of superclusters.