Hybrid model fit images of TXS 2013+370 at 86 and 43 GHz. The data were imaged using uniform weighting, without uv-tapering. At 43 GHz, the images are convolved with a common restoring beam of 0.2 × 0.1 mas, oriented at PA 0°, and the contour levels are set to 0.3, 0.6, 1.2, 2.4, 4.8, 9.6, 19.2, 38.4, and 76.8% of the peak flux density (see Table B.1); at 86 GHz, images are restored with a beam of 0.16 × 0.08 mas, 0°, and the contour levels are set to 0.5, 1, 2, 4, 8, 16, 32, and 64% of the peak flux density (see Table B.1). The two beams are displayed on the left and right corners respectively. The time stamp for each image is indicated on the x-axis.