Left panel: Spitzer/IRAC 4.5 μm view of the cluster volume (3′× 3′). The cluster center (central cross), R₅₀₀ (dashed blue circle), and R₂₀₀ (solid blue circle) are indicated, small circles mark spectroscopic members as in Fig. 2. The crossed-out cyan objects were removed from the analysis. Right panel: color composite with the same FoV by adding the V-band (blue) and the combined J + Ks image (green) to the Spitzer 4.5 μm data (red).