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Table 1.
Coefficients of the second-order polynomials used to describe each of the four arms of Sgr.
| Arm/branch | a | b | c |
|---|---|---|---|
| Trail/bright | 0.000 | 1.654 × 10−3 | −2.214 |
| Trail/faint | −1.563 × 10−3 | −2.805 × 10−1 | −3.040 |
| Lead/bright | −3.260 × 10−4 | −4.828 × 10−2 | 3.708 |
| Lead/faint | −3.819 × 10−4 | 1.904 × 10−2 | 6.084 |
Notes. Each polynomial is of the form 
, with both angular coordinates expressed in degrees.
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