NGC 4388 maps. Top left panel: ¹²CO(1–0) Moment 0 map, contours: 1, 12, 23, 34, 45, 56, and 67 M_⊙ pc^-2. Top right panel: ¹²CO(1–0) Moment 1 with 2370 ≤ v ≤ 2800 and Δv = 43 km s^-1. Middle left panel: ¹²CO(2–1) Moment 0 map, contours: 0.01, 8.6, 17.3, 26, 34.7, 43.3, and 52 M_⊙ pc^-2. Middle right panel: ¹²CO(2–1) over ¹²CO(1–0) ratio. The beam size is shown in the bottom left of each panel. Bottom panel: channels map of ¹²CO(1–0) with 2304 ≤ v ≤ 2744 km s^-1 and Δv = 10 km s^-1.