Naturally weighted VLBI images of J2102+6015. Left: at 2.3 GHz. The peak brightness is 123.3 mJy beam⁻¹. The lowest contours are at ±0.4 mJy beam⁻¹ (∼3σ); the positive contour levels drawn with solid lines increase by a factor of 2. The image is restored with a circular Gaussian beam of 2.8 mas (FWHM) as indicated in the lower left corner. Right: at 8.6 GHz. The peak brightness is 82.4 mJy beam⁻¹. The lowest contours are at ±0.22 mJy beam⁻¹ (∼3σ), the positive contour levels increase by a factor of 2. The image is restored with a circular Gaussian beam of 0.7 mas (FWHM).