**Table 5:** SiO ring diameter variations.
Star	Mean¹	Mean	rms¹	percent¹	Mean²	Mean	rms²	percent²
	(mas)	(2 $R_{2.2~\mu {\rm m}}$ )	(mas)	(%)	(mas)	(2 $R_{2.2~\mu {\rm m}}$ )	(%)
omicron Ceti	70.3	2.88	7.0	10	68.3	2.80	5.0	7
U Orionis	29.3	1.88	1.0	3	27.5	1.76	0.2	0.7
R Leonis	57.4	1.95	4.3	8	54.5	1.85	5.3	10
S Coronae Boralis	20.6	1.82	1.9	9	18.9	1.67	0.5	3
U Herculis	25.3	2.30	1.6	9	22.6	2.06	1.7	8
R Aquarii	32.6	1.93			31.9	1.90
R Cassopeiae	49.9	2.01			45.9	1.85

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

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