Top panel: integrated intensity of the HCN J = 3−2ν₂ = 1f line emission where the contour levels are 0.14 × (1,3,5,7,9) Jy beam^-1 km s^-1. The peak flux is 1.5 Jy beam^-1 km s^-1 and the cross marks the position of the peak HCN 3–2 integrated intensity. Lower panel: velocity field with contour levels starting at − 60 km s^-1 and then increasing by steps of 15 km s^-1 until +30 km s^-1. The grey (colour) scale ranges from − 60 to 40 km s^-1. (In the online version of this figure the greyscale is replaced with a rainbow color scale ranging from dark blue to red.)