Rotational support parameter κ_rot as function of galaxy stellar mass. Solid and dashed lines show results for stars within the galactic radius (r < r_glx = 0.15 r₂₀₀) and in the outer regions (r > 1 kpc), respectively. Black lines represent all stars, while magenta lines represent young stars (i.e. age < 1 Gyr). Young stars in the outer regions (magenta dashed line) have κ_rot > 0.7 and tend to be rotation-supported in all galaxies. Conversely, young stars as a whole (solid magenta line) are non-rotating at low masses (κ_rot < 0.5); this is because in these systems most stars form in the central, non-rotating clump. Symbols correspond to galaxies A, B, C, and D, identified according to colour (as in Figure 2; squares: κ_rot; triangles: κ_rot, young). A thinner magenta line indicates results when only galaxies with at least 50 young stars in the outer regions are included in the analysis.