1. Introduction
1.2. Measuring $j_{*}$ in ETGs
1.3. This paper
2. The data
2.1. The ePN.S survey and the ETG sample
2.2. Kinematic data in the central regions
2.3. Photometric data
2.4. Distances, effective radii, and stellar masses
2.5. Reconstructing 2D velocity fields
2.6. Reconstructing galaxy images
4. The projected specific angular momentum of the ePN.S galaxies
4.1. Aperture $j_{p}(\leq a)$ profiles: weighting by light
4.2. Aperture $j_{p}(\leq a)$ profiles: weighting by stellar mass
4.3. Errors on the total projected sAM $j_{p}$
4.4. The $j_{p}-M_{*}$ diagram
5. The projected sAM of the Illustris TNG ETGs
5.1. Sample selection and derivation of physical quantities
5.2. Comparison with the ePN.S ETGs
6. The contribution of the outskirts $(a>6R_{e})$ to the total $j_{p}$
7. Deprojecting the galaxy angular momentum
7.2. The projection factor from observed $\Lambda-\varepsilon$ plane
8. The total sAM of the ePN.S galaxies
8.1. The $j_{t}-M_{*}$ diagram
8.2. The $j_{t}-M_{*}$ diagram for FRs and SRs
8.3. Comparison with previous work
8.4. Comparison with spiral galaxies
8.5. Comparison with simulations
9. The retained fraction of angular momentum
10. Conclusions