Spatial-kinematical distribution of the H¹²CN(J = 4 → 3) line emission in Sakurai’s object. Left: spatial distribution of the centroid positions of the H¹²CN(J  =  4  →  3) line emission at each individual velocity channel. Right: position–velocity diagram of the H¹²CN(J = 4 → 3) line emission centroids along the Declination axis. The vertical and horizontal dashed lines indicate the velocity offset and Declination offset, respectively, over which an inversion of the velocity gradient is observed. The error bars correspond to the uncertainties of the centroid positions. The axis indicating the linear scale assumes a distance of 3.5 kpc to the source.