Ratio of the observed to predicted SAM j_obs/j_final. To facilitate the comparison, j_obs is multiplied by a factor of (B_⋆/0.5 kG)^1.1 (see text). The vertical dashed line indicates a perfect agreement between the observed value and our model j_ref(M_⋆). The gray area accounts for different stellar and disk parameters. The SAM values j_BI and j_BV are based on B_I and B_V functions as the upper and lower boundary for the stellar SAM. They are indicated by left and right-facing triangles, respectively. The single measured value (and uncertainties) of j_BQU (diamond marker) is based on B_QU for the star AU Mic. The measurements are tabulated in Table C.1.