DESI r-band image (north top and east left) of the MACS0329 with Chandra X-ray isocontour levels (in red) superimposed (energy range: 0.5−7 keV). The small blue symbols indicate galaxies whose photometric redshifts are close to that of MACS0329. In particular, the blue squares highlight galaxies belonging to significant structures according to our Voronoi analysis. Concentrations of galaxies are indicated by large blue circles. The largest circle indicates MACS0329 with its strong X-ray emission. The galaxy system to the south is already detected in the redshift space (GrG3). The system further south lies outside the region covered by our redshift catalog. The system in the northeast shows an extended X-ray emission and we identify it with 2CXO J033045.8−020323.