Line profiles of selected transitions of model 6j. The full lines show the simulated profiles, the dashed lines are Gaussian profiles with the same peak intensity as the respective profile, but with linewidths of FWHM = 2 km s^-1 and FWHM = 4 km s^-1, matching the observed total velocity dispersions. For each transition the y-offset corresponds to the position with the highest line-integrated intensity.