Top-left: SED of AGS4. Top: photometric redshift PDF derived by EAzY (Brammer et al. 2008). Bottom: SED fittings. The green curve shows the best-fit of AGS4 at z_phot = 4.02 using EAzY, and we shift the SED to the spectroscopic redshift (z_spec = 3.556) of AGS4 in light blue for comparison. The gray curve shows the SED of the optically bright neighbor, ID_ZFOURGE = 12 333. Top-right: SED of AGS15. The blue curve shows the best-fit at z_phot = 3.96 derived by EAzY and we shift the SED to the redshift peak of the overdensity, at z = 3.472, in light blue for comparison. The gray curve shows the SED of the optically bright neighbor, ID_CANDELS = 3818. Bottom-left: SED of AGS24. Same as AGS15. Bottom-right: SED of AGS25 at z_phot = 4.70, fitted by EAzY with the photometry retrieved from the ZFOURGE catalog.