Left image: 15 GHz total intensity (contours and colour scale) image of PG 1553+113 during the third observing epoch (MJD 57276), convolved with a 0:6 mas 0:6 mas circular beam. The overlaid lowest total intensity contour is at 0.6% of the peak, with the following contours a factor of two higher. The ridge line is overlaid as a yellow line. Right image: same 15 GHz image in polar coordinates. The colour scale represents the total intensity emission and the white line represents the ridge line.