Comparison of the annular profiles of the new CO (2−1) data with Paα, 8.4 GHz (X-band), 5 GHz (C-band) and 1.4 GHz (L-band) data from Olsson et al. (2010)a), top left. These profiles, obtained by azimuthally averaging the flux density in 0.1′′ wide annular circular rings, are nominally centered on the center of the Paα ring. Profiles of each tracer in different regions of the ring are presented from top right to bottom left: Paαb), CO (2−1) c), 8.4 GHz d), 5 GHz e) and 1.4 GHz f). Spatial resolutions of the data used for the profiles are ~0.2′′ for Paα, ~0.3′′ for the L-, C- and X-band observations and the spatial resolution for the CO data is ~0.5′′.