Galactic longitude versus radial velocity integrated for slices of Galactic latitude. Latitude ranges from b = + 0.5° (top left panel) to b = −3.0° (lower right panel). Crosses mark the CO(2–1) velocity components along a line-of-sight, with colored dots indicating associated dust clumps. Sizes correspond to the integrated line intensity and the colors for the dust clumps to the 22 μm WISE emission being indicative of ongoing star formation. The background image shows the corresponding H I integrated intensity from the GASS survey (McClure-Griffiths et al. 2004). The contours mark the CO(1–0) emission from Dame et al. (2001) at levels of 3σ, 5σ, 7σ and the 10th, 30th, 50th and 70th percentile. The spiral arms as determined in the present work and the position of the local emission are marked by the colored solid lines. Cyan: local emission; green: Perseus arm; red: outer arm. The solid magenta ellipse marks the position of the Galactic supershell GSH 242-3+37.