Table 2: SiO ring diameters.
  Jan. 01 (A)   Apr. 01 (B)   Aug. 01 (C)   Nov. 01 (D)  
Source1 Diam. (mas) Width Diam. (mas) Width Diam. (mas) Width Diam. (mas) Width
o Cet [1] 73.0 6.0 72.4 4.7 60.0 4.3 75.6 3.7
o Cet [2] 67.6 4.7 64.4 6.1 65.6 5.5 75.4 4.4
U Ori [1] 29.3 0.9 28.0 0.7 29.8 0.4 30.2 0.6
U Ori [2] 27.8 0.9 27.5 0.5 27.5 0.8 27.3 0.6
R Leo [1] 59.2 1.7 51.2 2.2 57.9 7.0 61.2 3.6
R Leo [2] 56.1 1.6 49.3 2.2 51.3 4.3 61.2 2.2
W Hya [1]         83.6 5.0    
W Hya [2]         76.1 3.7    
S CrB [1] 19.5 1.2 19.3 1.0 20.0 0.6 23.4 1.2
S CrB [2] 18.3 0.9 19.3 0.7 18.8 0.4 19.3 0.8
U Her [1] 26.6 2.2 26.7 1.6 24.2 1.0 23.7 1.3
U Her [2] 24.5 1.6 23.7 1.0 21.3 1.3 21.0 1.0
R Aqr [1] 32.6 1.5 32.6 1.3        
R Aqr [2] 32.8 1.6 31.1 1.3        
R Cas [1]         49.0 3.0 50.8 2.1
R Cas [2]         44.5 5.4 47.3 2.1


1 [1] denotes $\nu = 1$, J=1-0 transition of SiO at 43.1 GHz. [2] denotes $\nu = 2$, J=1-0 transition of SiO at 42.8 GHz.


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