Natural-weighted images of the phase-reference calibrator J1427+2348. In each image, the bottom left ellipse is the shape of the restoring beam. The colour bar denotes the brightness. Left: EVN image at 1.66 GHz. The rms noise is 0.05 mJy beam⁻¹, and the beam size is 7.7 × 2.9 mas² at a position angle of 13.4°; middle: VLBA image at 1.57 GHz. The rms noise is 0.05 mJy beam⁻¹, and the beam size is 11.7 × 5.5 mas² at a position angle of 1.6°; right: VLBA image at 4.9 GHz. The rms noise is 0.04 mJy beam⁻¹, and the beam size is 3.9 × 1.7 mas² at a position angle of −1.3°. The lowest contours represent five times of the background rms noise, and the contour levels increase by a factor of 2.