Left panel: spectral index map between the third epoch VLBA 43 GHz map and the GMVA 86 GHz map. The contour map shows the VLBA 43 GHz map, with the contour levels drawn at (-1, 1, 2, 4, ‥) × 9.0 mJy beam-1, which is three times the rms noise of the off-source region of the 86 GHz image. Black dotted lines show the locations of the slices and black stars indicate the centroid positions of the fitted Gaussian models. Right panel: A) Slice profile of spectral index map shown in Fig. 9 along Gaussian center of the core and the NE component at PA = 20.1° for the third epoch 43 GHz observations. The gray area indicates 1σ errors on the spectral index. The black stars show locations of the Gaussian models for the core and the NE component in the third epoch 43 GHz map. B) Slice profile of spectral index map shown in Fig. 9 along Gaussian center of the core and the SE component at PA = 155.8° for the GMVA 86 GHz observations. The black stars show locations of the Gaussian models for the core and the SE component in the 86 GHz map.
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