CO J = 3–2 velocity dispersion for five galaxies which are members of the Virgo cluster and NGC 2403, which is the closest galaxy in our sample. Colour scale runs from 0 (black) to 50 km s⁻¹ (white) and contour levels are 10, 20, 30, 40 and 50 km s⁻¹ unless otherwise noted. (a) NGC 4254. (b) NGC 4303. (c) NGC 4321. (d) NGC 4501. Contour levels are 10, 20, … , 60 km s⁻¹ and the colour scale peak is 65 km s⁻¹. (e) NGC 4535. (f) NGC 2403. Contour levels are 5, 10 and 15 km s⁻¹ and the colour scale peak is 25 km s⁻¹.