Fig. 1.
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Spectral index maps between 22 and 43 GHz obtained from VLBA and KaVA observations. All images have been rotated by −18°. The restoring beam size is 1.2 mas × 1.2 mas, drawn as a black circle in the bottom-left corner. Observing dates are shown to the left of each map. The contours represent the total intensity at 22 GHz. Contours start at 3σrms, increasing in steps of 2.
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