Left panel: real value of visibilities for a point source as predicted by direct evaluation of the ME, and degridding by the classical gridder and image domain gridder. The visibilities are too close together to distinguish in this graph. Middle and right panels: absolute value of the difference between direct evaluation and degridding for a short (1 km) and a long (84 km) baseline. On the short baseline, the image domain gridder rms error of 1.03e-05 Jy is about 242 times lower than the classical gridder rms error of 2.51e-03 Jy. On the long baseline, the image domain gridder rms error of 7.10e-04 Jy is about seven times lower than the classical gridder error of 4.78e-03 Jy.