Positions of the cluster members with respect to the peak of their projected number density (the center is at , 0). North is up and east is to the left. Galaxy positions are indicated by circles with sizes proportional to 1 / (m_R − 16.5), where m_R are the galaxy red apparent magnitudes. Red (respectively blue) circles identify galaxies with v_rf ≥ − 677 km s^-1 (respectively <− 677 km s^-1), a limit that separates galaxies in the KMM-main subcluster from galaxies in the KMM-sub subcluster (see Fig. 6 in Sect. 4). The galaxy selected by D09 as the cluster center is indicated by a blue, cyan-filled, circle at { x,y } = { − 2.1,0.7 }. The purple circle has a radius of 1.24 Mpc and it indicates the cluster virial region (see text).