Integrated intensity maps in the 3 mm band observed with the IRAM 30m telescope towards the G183 region. The colour plot in each panel is the integrated emission of C¹⁸O(1–0) and the contours correspond to molecular transitions, as is indicated above the panels in units of K km s⁻¹ with step sizes in brackets. Above each panel the contour levels are given to the right. The intensities are integrated between velocities of −12 to −2 km s⁻¹, except for N₂H⁺(1–0), which is integrated between −22 to 0 km s⁻¹. In the top left panel, the region mapped at 1.4 mm is shown by the smaller box. Positions selected for further analysis are shown as ‘+’ in the bottom right panel and marked as S1 (0″, 0″), S2 (123″, −125″) and S3 (−15″, −96″). The solid curve drawn on the C¹⁸O(1–0) map shows the direction in which the velocity analysis including the position-velocity diagram (Fig. 5) was done. The HPBW is shown on the lower right.