Ensemble-averaged ϵ_RMSE as in equation (36) in percent for the (a) reconstructed equivalent sources of the baffled piston, retrieved from measurements with SNR=28 dB taken at a distance of z_m=6 cm, along with their radiated (b) sound pressure, (c) normal velocity, and (d) normal intensity field reconstructed at a distance of z_R=3 cm, as in equations (4)–(6). The vertical line at f=2401 Hz marks the spatial sampling limit.