Left: rest-frame M_r′/M_NUV − M_r′ CMD of all galaxies in the entire CFHTLS-D1 field with secure redshifts 2.9 <z_spec< 3.7 and stellar masses log (ℳ_s) > 9. The stellar mass cut is imposed here in an attempt to mitigate any induced differential bias between the field and protocluster members (see Sect. 4.1.2). The meanings of the symbols are identical to those of Fig. 9 as is the meaning of the light blue-shaded region and the galaxy model tracks. Here and in the right panel, color and absolute magnitude histograms, normalized such that the maximum value is unity, are shown for each population. While most protocluster members have relatively typical colors and magnitudes with respect to the field, there exists a sub-dominant population of extremely bright (and typically redder) protocluster galaxies. The median SFRs, as derived from the SED fitting process, of the two samples is shown in the upper right hand corner. Right: color−stellar-mass (CSMD) of the same galaxy populations shown in the left panel. The meanings of all symbols are the same. The bimodality observed in the CMD remains in the CSMD, with several protocluster galaxies having with extreme stellar masses log (ℳ_s)_~^>10.8. These galaxies comprise some of the most massive galaxies in the entire spectroscopic sample in the range 2.9 <z_spec< 3.7. Though several field galaxies exhibit similar colors and stellar masses, the volume used to define the field sample is ~250 larger than that used to define the bounds of the protocluster. The proto-BCG, marked by the circumscribed cyan circle, likely has its stellar mass estimate contaminated by the presence of its powerful AGN, though the other two type-1 AGN hosts likely do not.