¹²CO line channel maps towards G152.4−2.1. The brightness scale is antenna temperature T_A in K, and the angular resolution of the maps is 1′. Three thick white-on-black contours traced at 100, 130 and 160 mK delineate the total power appearance of G152.4−2.1 at 21 cm. Overlaid on each map are thick pure white contours that outline HISA clouds seen in CGPS H i maps at the same velocities. A single T_B = 90 K contour (very thin black) outlines the brightest H i cloud in the field, appearing in between the molecular clouds that follow the outside of the southern shell. All of this activity peaks at v_LSR = −12 km s^-1.