Continuum images of 4C 52.37 (top) and 3C 293 (bottom) convolved with a synthesized beam of 20 mas and 25 mas, respectively, which is marked by the gray circle. The top panel also shows a higher resolution (6 mas) zoom-in of the central region of the radio source. The contour lines begin at three times the noise level of the corresponding image and increase logarithmically by a factor of 2. The solid, horizontal scale bar represents the spatial scales.