PA diagrams. Left: comparison between morphological and kinematic major axis PAs for the stellar (yellow) and gas (red) components. The dashed blue line indicates the 1:1 relation; the blue-shaded region (±22°) includes 90% of the morpho-kinematic PA misalignments of a sample of 80 non-interacting galaxies from the CALIFA survey (Barrera-Ballesteros et al. 2015). Right: comparison between stellar and gas kinematic major axis PAs. The dashed line indicates the 1:1 relation; the shaded region (±15°) includes 90% of the kinematic PA misalignments of non-interacting CALIFA galaxies (Barrera-Ballesteros et al. 2015).