Table 1: Observed maser transitions and results of the fits.
Specie  Transition Restoring  $\bar{R}$   $\triangle{R}$ Center
     beam (mas $~~\!\!^{\rm 2}$)  (mas)  (mas) ($X_{\rm c}$, $Y_{\rm c}$)
28SiO  v = 1    J = 1-0 0.78 $\times$ 0.50  29.24  6.42 (26.9, -21.3)
   v = 1    J = 2-1 0.50 $\times$ 0.50  33.84  4.20 (-35.2, -4.7)
   v = 2    J = 1-0 0.50 $\times$ 0.50  25.92  6.88 (25.5, -16.3)
29SiO  v = 0    J = 1-0 0.78 $\times$ 0.22  one spot  - -
   v = 0    J = 2-1 non-det.  -  - -

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