Mass dependence vs. distance in HST’s F814W filter at depth 28.5 mag. This figure is the differential version of Fig. 11. The colors and linestyles of the curves have the same interpretation as in the previous figure (that is, yellow is for the farthest distance to the caustic and black for the closest). The dashed line again represents the case where Σ_* = 5 M_⊙ pc⁻² as in Fig. 11. The plateau in the yellow curve marks the transition in the M–L relation at M ≈ 55 M_⊙.