NGC 4189 maps. Top left: ¹²CO(1–0) Moment 0 map, contours: 4.2, 6.9, 9.6, 12.3, 15, 17.7 M_⊙ pc^-2. Top right: ¹²CO(1–0) Moment 1 with 2000 ≤ v ≤ 2230 and Δv = 28 km s^-1. Middle left: ¹²CO(2–1) Moment 0 map, contours: 4, 7.25, 10.5, 13.75, 17, 20.25, 23.5 M_⊙ pc^-2. Middle right: ¹²CO(2–1)/¹²CO(1–0) ratio. The beam size is illustrated in the bottom left of each panel. Bottom panel: channels map of ¹²CO(1–0) with 1980 ≤ v ≤ 2250 km s^-1 and Δv = 10 km s^-1.