Fig. 3
From: Astrometrically registered maps of H2O and SiO masers toward VX Sagittarii
Registered maps of the SiO maser spots and the histograms of their radial distributions. The blue, red, yellow, and cyan colors indicate 43.1, 42.8, 86.2, and 129.3 GHz SiO masers, respectively. The dotted circle shows the result of ring fitting using all the maser spot distributions of the four maser lines. The mark “x” indicates the ring fitting center assumed to be the position of the central star. Histograms represent the radial distribution of the maser spots with respect to the central star. The ring radius and FWHM derived from the Gaussian fitting are represented in each panel
