Projected sAM j_p(≤ 1R_e) in the TNG100 ETGs compared to Atlas3D galaxies. Colored symbols show the sample of ETGs, gray small symbols show all the other galaxies (namely the bluer and lower-mass systems). The ETGs are color-coded according to the angular momentum parameter λ_e integrated within 1R_e. Arrows on the Atlas3D galaxies show values integrated out to a < 1R_e, hence the show j_p is likely a lower-limit estimate. Dashed black lines show the j_t − M_* relations for different bulge fractions β as derived by Fall & Romanowsky (2018). The different j_p − M_* relation between observed and simulated galaxies shows that the TNG100 ETGs have their angular momentum distributed at larger radii.