Spatial and redshift distribution of galaxies in the ALT catalog with overdensities marked. Spatial and redshift distribution of galaxies from the ALT catalog in the range 5.5 < z < 7. The horizontal axis shows the grism redshift (z_grism, ALT), while the vertical axis indicates the comoving offset in declination (ΔDec; [cMpc]). Marker size reflects the comoving offset in right ascension (ΔRA; [cMpc]), ranging from −6.5 to 5.3 cMpc, with larger symbols corresponding to larger offsets. Galaxies belonging to the five most significant overdensities identified by the FoF algorithm are shown in colour, while all field galaxies are displayed in gray.