Fig. 1
Carlina-OHP experiment: in September 2013, the helium balloon (Papers I and II) was replaced by a truck crane. The thickness of the cables and the diameter of the primary mirrors (25 cm) have been enlarged to make them visible on this scale drawing. An elastic rope attached to the ground passes through a pulley at the top of the crane and pulls on the same cable, with the same force (1100 N) as the helium balloon.
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