Open Access

Fig. A.1.


Spectral index of HD 167971 between X-band and C-band of the 2016 epoch is represented in colour. In contours (representing 30, 50, 70, and 90% of the peak) the image displays the structure of HD 167971 observed at the X-band. We note how the index across the whole structure is quite consistent around α = −1.1, confirming the nonthermal emission of the observed radio emission.

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