Fig. 2
USco HI shell at VLSR = 5.77 km s−1 from GASS HI data. The white contours represent the NH map smoothed with a 5-pixel σ Gaussian kernel, where the contour levels are at 2.5, 4.5, and 8.0 × 1021 cm−2. The yellow and red crosses show the position of the USco and UCL subgroups, respectively, according to the hipparcos catalogue (de Zeeuw et al. 1999).
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