Table 1.
Properties of the main subsamples in our study.
| Volume | R | ϕ | Counts |  |
|---|---|---|---|---|
| (kpc) | (º) | (km s−1) | ||
| SN | 8.24−8.44 | −1.5 ∼ 1.5 | 435 801 | 0.83 |
| V1 | 6.24−6.44 | −1.5 ∼ 1.5 | 6920 | 3.45 |
| V2 | 6.74−6.94 | −1.5 ∼ 1.5 | 10 959 | 2.53 |
| V3 | 7.24−7.44 | −1.5 ∼ 1.5 | 20 743 | 1.93 |
| V4 | 7.74−7.94 | −1.5 ∼ 1.5 | 88 184 | 1.99 |
| V6 | 8.74−8.94 | −1.5 ∼ 1.5 | 77 457 | 1.95 |
| V7 | 9.24−9.44 | −1.5 ∼ 1.5 | 13 006 | 1.94 |
| V8 | 9.74−9.94 | −1.5 ∼ 1.5 | 5994 | 2.39 |
| V9 | 10.24−10.44 | −1.5 ∼ 1.5 | 3340 | 2.79 |
| V10 | 8.24−8.44 | −12 ∼−9 | 10 579 | 1.63 |
| V11 | 8.24−8.44 | −6 ∼−3 | 72 524 | 1.75 |
| V12 | 8.24−8.44 | 3 ∼ 6 | 64 849 | 1.71 |
| V13 | 8.24−8.44 | 9 ∼ 12 | 9753 | 1.62 |
Notes. In the first column, the name of the volume is shown according to Fig. 1. Columns 2 and 3 contain the ranges of the radial and azimuthal coordinates. The last two columns show the summary statistics Counts and 
that are, respectively, the number of stars in the subsample and the square root of the trace of the median velocity error covariance matrix in cylindrical coordinates.
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