The red squares show the positions of the pads of the previous configurations. The blue crosses represent the antenna positions being optimized. The grey areas are the topographic constraints: regions where the slope is too steep (>5deg). On the right the radial (top) and azimuthal (bottom) distributions of visibilities are represented in blue. The dashed red line represents the ideal distribution the array is optimized for. After some iterations the antennas which are near an existing pad are fixed on this pad.