Left: H i column density map of USco and surroundings of Lupus Icalculated from the integrated emission for v_LSR = 0–10 km s^-1. The two black circles indicate the inner and outer radius of the USco shell from the model fit. The black and white contours represent the dust emission at 850 μm and the CO(1–0)emission from Planck, respectively. The blue and black labeled dots represent early B-type stars in USco and UCL, respectively. Right: zoom into the region indicated as a dashed black box in the left panel.