Median difference between the total, galaxy-integrated j_p and j_p ≤ 6R_e, divided by j_p, as a function of stellar mass in the TNG100 ETGs. Galaxies are divided into FRs (blue lines) and SRs (red lines). Solid thick lines are for j_p integrated out to 15R_e; the shaded areas report the quartiles of the distribution. The dashed lines are for j_p integrated out to the outermost bound particle, while thin solid lines are for apertures of 10 and 12.5R_e.