Photo of the Carlina mirrors. We see the three baselines of 9   m, 5   m, and 10.5   m oriented respectively N/S, E/W and NE/SW, around the metrology table described in Fig. 7. The black hood is closed, and the trap door of the field mirror is open as during the observations. The total station helps to position the primary mirrors before observation. On this picture, the total station points to a corner cube positioned on the edge of the W mirror (Fig. 6).