Actuators in the subreflector as seen from the x_fy_f–plane. The subreflector diameter is labeled as D_s = 6.5 m. Its profile shape is elliptic as seen in Fig. B.1 (left). Dots represent the position of the actuators. The actuators are separated between 15 deg and in four concentric rings: 1210mm, 1880mm, 2600mm and 3250mm. The minimum distance between actuators is 63 mm, and only present in the inner ring. There are 72 + 1 panels. Diagonal lines in the inner area corresponds to the subreflector prime focus receiver blockage (1.25 m diameter). The out-of-focus holography was only performed with secondary focus receivers.