Hα line intensitymaps for two velocity ranges, [−60, −11] (top) and [−11, 50] km s−1 (bottom), overlaid with NH I column density and WCO emission contours outlining the different cloud components: the east shell in H I (red, 1.5 × 1020 cm−2), the west rim in H I (cyan, 4 × 1020 cm−2), the south loop in H I (green, 2.5 × 1020 cm−2), and the north rim in CO (yellow dashed line, 1 K km s−1). The NH I and WCO maps are smoothed with a Gaussian kernel of 0. °28 to displaythe contours. A specific north rim contour is shown in H I for central line velocities of +9 km s−1 (dark blue dash-dotted line, 18 K). It was smoothed with a Gaussian kernel of 1. °5 before the contours were computed.
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