Inferred near-core rotation frequencies of the Gaia gravity-mode pulsators plotted as a function of evolutionary stage (grey dots), assuming solar metallicity (2464 stars, top panel), [M/H] = −0.25 (2439 stars, second panel), and [M/H] = −0.5 (2375 stars, third panel). Solid lines indicate spline fits through binned averages (see text). The bottom panel shows the derivatives of the splines from the three upper panels, indicating the change in the near-core rotation frequency with respect to the fraction of hydrogen in the core. The dotted grey line separates positive and negative values.