Raw instrument response ℛ_raw(u, v,λ) or the (u, v) plane coverage at 710 MHz (redshift z = 1) for four configurations. a) 121 D_dish = 5-m diameter dishes arranged in a compact, square array of 11 × 11, b) 128 dishes arranged in 8 rows of 16 dishes each (Fig. 4), c) 129 dishes arranged as shown in Fig. 4, d) single D = 75 meter diameter, with 100 beams. The common color scale (1 ...80) is shown on the right.