... H. Falcke

Present Address: ASTRON, PO Box 2, 7990 AA Dwingeloo, The Netherlands.

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... 22.6 Mpc

We assume a Hubble constant of H₀=65 km s^-1 Mpc^-1 and use the measured redshift of z=0.0049 by Knapp et al. (1978). This results to a linear scale of 0.11 pc mas^-1.

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... (VLBA)

Napier (1994); the VLBA is operated by the National Radio Astronomy Observatory (NRAO), a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

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... COMB

At each pair of pixels of the two (coinciding) images, the spectral index $\alpha$ ( $S \propto \nu^\alpha$) is calculated from the flux densities per beam S₁ and S₂ at the two frequencies $\nu_1$ and $\nu_2$: $\alpha = (\log{S_1} - \log{S_2}) / (\log{\nu_1} - \log{\nu_2}).$

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... densities

We estimated the statistical standard uncertainty of all quantitiesderived from the model component flux densities. The calculated errors are shown in the plots, when they are not negligible.

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... material

Free-free absorption is an indicator of the column density $N_{\rm e}$ of free electrons in an ionised medium, rather than the column density of neutral hydrogen $N_{\rm H}$. In a fully ionised medium, $N_{\rm e}=N_{\rm H}$ holds.

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