SiO masers from AGB stars in the vibrationally excited v = 1, v = 2, and v = 3 states

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Table 2

Summary of the mean radius and width (in mas) obtained for the three transitions ²⁸SiO v = 1, v = 2, v = 3, J = 1–0 by fitting a ring-like brightness distribution to the observed emission using the regression package ODRpack.

Source	v = 1		v = 2		v = 3
	Radius	Width	Radius	Width	Radius	Width
	(mas)	(mas)	(mas)	(mas)	(mas)	(mas)

R Leo	30.14	0.43	28.77	1.80	indet.	indet.
TX Cam	16.05	1.16	15.63	1.50	16.07	1.14
U Her	10.82	1.19	10.43	1.66	10.9	0.46
IK Tau	16.02	0.42	15.42	1.57	14.9	0.38

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