XMM-Newton X-ray image (upper left), residual image (upper right), and zoom on the residual image (lower left). The residual image was obtained by subtracting the model from the image for CL 0016+1609. The large blue circle in the upper left panel corresponds to a 500 kpc radius circle centred on the cluster position found in the literature. The large red circles in the upper right panel show the positions of the known active objects along the line of sight, the small red circles show the positions of the galaxies belonging to structures beyond the cluster from the SG analysis, and the small blue circles show the positions of the galaxies belonging to structures in front of the cluster from the SG analysis. The red numbers in the lower left panel show the positions of the galaxies belonging to substructures in the cluster from the SG analysis, the number being the one given in Table 2. Finally, blue contours in the lower left are the X-ray residuals, starting at the 2.5σ level and spaced by 1σ intervals. Lower right: redshift histogram for the CL 0016+1609 area. Note that circles in the upper right panel of this figure (and of the following ones) are sometimes outwith the limits of the image, showing the immediate environment of the cluster considered.