Surface radial density of K_s sources derived in concentric annuli centred at the position of B, the brightest cluster member. The solid line indicates the density as computed from the LUCI photometry. The dashed line indicates the density computed by replacing the LUCI photometry with the PISCES photometry inside the area corresponding to the field of view of PISCES. The sources are counted up to the LUCI completeness limit (i.e. K_s ≃ 17.75). The errorbars show the Poissonian count fluctuations.