The effective magnetic field 𝐵𝐵eff at the site of the nucleus can be described in terms of the sum of the external and the induced magnetic fields 𝐵𝐵 𝑒𝑒𝑒𝑒𝑒𝑒 = 𝐵𝐵 0 + 𝐵𝐵 𝑖𝑖𝑖𝑖𝑖𝑖 . The induced field is described by the magnetic shielding anisotropy (CSA) tensor 𝜎𝜎 ⃡ interacting with B0: