Top: relative inertia contributions I₁/I (green dots connected dashed line dots correspond to modes) and I₂/I (Eq. (14)) (black), relative contribution ζ = I_core/I (magenta dashed line, hexagons correspond to modes). Bottom: contribution to the rotational splittings for model M1 due to only (green dashed line dots correspond to modes), contribution due to alone (black dashed lines and hexagons), contribution due to z₁z₂ alone (red-dashed line, dots correspond to modes); contribution to δν_nl due to the core alone (magenta-filled hexagons).