Table 1
Measured centroid distances of the 28SiO λ3 mm maser emission (obtained from the Gaussian features and the velocity-integrated intensity map) and the λ7 mm v = 1,2 maser emission (obtained from the velocity-integrated intensity maps) from Source I, and offsets between the λ3 mm and λ7 mm maser emission of each arm from the velocity-integrated intensity maps.
| Region |  [AU] |
 [AU] |
Rmap [AU] | Rmap [AU] |  for λ3 mm v = 1 |
ΔRmap for λ3 mm v = 1 |
| (λ3 mm v = 1) | (λ3 mm v = 1) | (λ7 mm v = 1) | (λ7 mm v = 2) | and λ7 mm v = 1 [AU] | and λ7 mm v = 2 [AU] | |
|
|
||||||
| North | 48 ± 8 | 52 ± 2 | 44 ± 8 | 35 ± 7 | 8 | 17 |
| West | 39 ± 6 | 40 ± 9 | 34 ± 6 | 34 ± 6 | 6 | 6 |
| South | 41 ± 5 | 39 ± 2 | 36 ± 5 | 32 ± 5 | 3 | 7 |
| East | 48 ± 8 | 47 ± 9 | 35 ± 7 | 34 ± 7 | 12 | 13 |
Notes. (a) Centroid distances per arm obtained from the Gaussian features; (b) centroid distances per arm obtained from the velocity-integrated intensity maps; (c) relative offsets of emission centroids obtained from the velocity-integrated intensity maps.
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