Specific angular momentum, J/M, plotted logarithmically against stellar mass (upper panel) and evolutionary stage (lower panel). The symbol size for each star scales linearly with its evolutionary stage X_c/X_ini (upper panel) and mass (lower panel). The circles show the stars of Samples 1 and 2. Also shown are the J/M values of 21 SPB stars from Pedersen (2022a,b triangles, from her Tables 4 and 5), connected by a dotted line to the specific angular momentum of their convective core deduced from asteroseismic modelling of individual identified modes (shown as ×). Similarly, J/M of the 37 asteroseismically modelled γ Dor stars from Mombarg et al. (2021) are shown as filled squares connected to the specific angular momentum of their convective core (shown as +). The two dashed vertical lines in the upper panel indicate the mass regime [1.3, 1.4] M_⊙ where the Kraft break occurs. The two coloured full lines and their uncertainty regions (in grey) denote the upper limits of the J/M measurements for each of the two samples.