Best-fit model for the light distribution of the BGG and five nearby group members. From top to bottom: observed HST F160W band image, the best-fit model, and the normalized residuals in the range −7σ to 7σ. In all three images, the constant areas are the masks covering the lensed arcs and other objects in the field. The panels cover a field of view of 36″ × 22″ and are oriented in the same way as in Fig. 1, with north approximately toward the bottom.