(Left) a) contours of integrated H i line emission (; V =  − 22.9 to  −14.7 km s^-1) and the optical image of Sh 2-217 (DSS2). Contour values 520 K km s^-1 (short-dash), 570 K km s^-1 (continuous), 620 K km s^-1 (dotted), and 670 K km s^-1 (long-dash). (Right) b) Superimposition of contours of the integrated H i line emission (contours as in left-panel) and a greyscale image of the ¹²CO(2−1) emission integrated between  −23 and  −15 km s^-1. In both panels, offset (0, 0) as in Fig. 3.