Total intensity and linear polarization 15, 43, 86, and 227 GHz CLEAN images. Color denotes the distribution of the fractional linear polarization overlaid with the sticks indicating the electric polarization vector directions, not corrected for Faraday rotation. A synthesized beam is shown by a shaded ellipse in the lower left corner and its size is given. The Stokes I contours are plotted at increasing powers of 4, starting from the corresponding 3 rms level. The P contours are drawn at a 4 rms level. Here, we plot interpolated 15 and 43 GHz images (see Sect. 2.6 for details). The original MOJAVE and BU-BLAZAR images are given in Appendix B.