Galaxy number density distributions for masses 10⁹<M_⋆/M_⊙< 10¹⁰ (left panel), and M_⋆> 10¹⁰M_⊙ (right panel) for the ensemble cluster at z ~ 0.15. Black points with the best-fitting projected NFW (dashed) and gNFW (solid) functions are our best estimates for the cluster number counts. The inner two points in the left panel are masked due to obscuration from the BCG, which is more severe for low-mass galaxies, and are excluded from the fitting. Purple points indicate the number of spectroscopically confirmed cluster members.