Primary beam of the entire array (large circle, constrained by the Arecibo primary beam) and position and FOV of the six correlation centers relative to the pointing center indicated by the cross at (0, 0). The central circle with no label corresponds to the correlation center labeled AC211 in Table 2. The radius of the FOV is defined as to allow a maximal loss of 10% in the response of a point source caused by time and bandwidth smearing.