Synthetic radio maps at 2.3 GHz (lower panel) and 8.6 GHz (upper panel) of the simulated jet model M2s (see Fig. 2 in Perucho & Martí 2007 for the typical hydrodynamic structure of such simulated jets). Shades of gray show the normalized intensity of the unconvolved radio maps. Assuming that the source is located at z = 1 contours show the degraded (convolved) image. Contour levels are 1, 2, 4, 8, 16, 32, and 64% of the peak intensity. The bright feature in the center of each panel is the hot spot, and vertical lines denote the longitudinal position of the peak intensity in the convolved image. The difference in position of the peak at two frequencies is very small.