VLBA total and linear polarisation images at different frequencies. Contours show total intensity above a threshold of 5σ; colour scale represents the linearly polarised intensity above 4σ; white ticks indicate the observed electric vector position angle. The peak value of total flux density is 2.83, 2.67, 1.55, 2.08, 3.89, 2.42 Jy/beam for 5, 8, 15, 22, 43, and 86 GHz, respectively. The corresponding rms is 12.55, 4.01, 1.96, 1.23, 2.64, and 5.49 mJy/beam.