Selected slices of Galactic latitude versus radial velocity integrated over 3° in Galactic longitude away from the Galactic supershell (top: higher longitudes than shell, bottom: lower longitudes of the shell). 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 reflect ongoing star formation as indicated by the 22 μm WISE emission. 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 5σ, 7σ, and the 10th, 30th, 50th and 70th percentiles. 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.