ALMA maps per velocity channel of ¹²CO J = 3−2 emission in IW Car. The continuum has been subtracted to better show the distribution of the weak line. The contour spacing is logarithmic: ±5, 15, 45, and 135 mJy/beam (equivalent to ±1.8, 5.1, 15.4, 46.2 K, in Rayleigh-Jeans equivalent temperature). The LSR velocities are indicated in each panel (upper-left corner) and the insert in the last panel shows the beam width.