conclusion is made for tests made out to redshift $z$ $\sim$ 2.5 [@lin16]. The density measure based on a photometric redshift dataset is therefore reliable and allows us to study the color$-$density relation in this work.

Results
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Radial Dependence
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### Specific Star Formation Rate, SSFR

We first investigate the radial dependence of the galaxy properties, i.e. study the galaxy properties as a function of a projected group-centric radius $r_p$ at fixed stellar mass, and their evolution in time. In Figure \[f6\], we plot the median specific star formation rates (SSFRs) as a function of the projected group-centric radius $r_p$ in different stellar mass ranges for star-forming galaxies (solid lines) and all galaxies (dashed lines) in group (left) and cluster (right) environments and in the lower-$z$ bin $0.2 < z < 0.5$ (top) and in the higher-$z$ bin $0.5 < z < 0.8$ (bottom). Four stellar mass bins we considered: $9.7 < \textrm{log}_{10}(M_s/M_\odot) < 10.1$ (purple), $10.1 < \textrm{log}_{10}(M_s/M_\odot) < 10.5$ (green), $10.5 < \textrm{log}_{10}(M_s/M_\odot) < 10.9$ (blue), and $\textrm{log}_{10}(M_s/M_\odot) > 10.9$ (gold). The threshold dividing the “star-forming” and “quiescent” galaxies is SSFR = $10^{-10.1}~$yr$^{-1}$ in 0.2 $< z <$ 0.5 and $10^{-10.0}~$yr$^{-1}$ in 0.2 $< z <$ 0.5. 