Comparison between data and ^3DBAROLO best-fit model for AzTEC/C159. Top row: seven representative channel maps showing the [C II] 158-μm emission of AzTEC/C159 (low spectral resolution data cube; see Table 3). The contours are at −2, 2, 4, and 8 times the rms noise per channel (σ). Line-of-sight velocities with respect to systemic velocity (set at v = 0) are shown on top of each channel map. Middle row: channel maps of the axi-symmetric best-fit model obtained with ^3DBAROLO; the contours are at the same levels as in the data. Bottom row: residuals (data minus model); pink contours are negative (−2σ), and light blue contours are positive (+2σ). In all panels, the green cross shows the dynamical centre, whose coordinates are given in Table 1.