Three galaxies in the foreground group are detected in HI: the ring galaxy (top left), NGC 3312 (top right), NGC 3314a (center bottom). The contours show that NGC 3312 and NGC 3314a are moving across the front of the cluster. H I contours (gray lines) are plotted at (1.2, 2.4, 4.8, 9.6) × 10²⁰ cm⁻² which corresponds to (4, 8, 16, 32) times the rms in a single 44 km s⁻¹ channel. H I contours for NGC 3314b are excluded for clarity (Fig. 2). This false color image has been made from a composite of all optical DECam data, including Hα. The small inset plot in the bottom right shows X-ray contours based on ROSAT All-Sky Survey data (Voges et al. 1999). The position of our three galaxies of interest is shown with the black stars. The blue box shows the size and location of the field presented in the large panel. In both panels north is up and east is left, parallel to the figure axes.