Selection of VLBI images of J1017+6116 observed at various dates and frequencies: S band (2 GHz), X band (5 GHz), and C band (8 GHz), as labeled. The grayscale ellipses indicate the estimated PSF. The dark green, blue, and magenta contour lines correspond to flux density levels for the S, X, and C bands, calculated as multiples of the standard deviation (3 × [1,  2,  4,  8,  16,  32,  64]) above the mean background level. A complete set of VLBI observations is provided in Appendix A.3.