Left: Color (U−r) stellar mass diagram for all galaxies in the simulation. Blue and red dots show disk and spheroidal galaxies, with stars highlighting galaxies with log₁₀M_⋆≥11. We chose a threshold $\lambda /\sqrt{ϵ}\ge 0.31$ to split the disks and spheroids. Right: Selection of massive galaxies in our sample. The upper and lower panels use two different selection criteria: $\lambda /\sqrt{ϵ}\ge 0.31$ and 0.71, respectively. Blue stars and red dots correspond to the disks and CSs associated with each sample, respectively. Contours are added for visualization purposes. Disk galaxies show a broad distribution in mass and color, but their density decreases dramatically toward higher stellar masses, as expected, populating the green valley preferentially for log₁₀M_⋆≥11[M_⊙]. Spheroidal galaxies dominate the red population at any stellar mass but can also be found as blue galaxies at low stellar masses.