Fast small-amplitude motions, such as vibrations or librations, do affect NMR properties of molecules in the solid state. The quantification of these effects is very important for structural studies exploiting Solid State NMR and computational methods, particularly in the field of NMR crystallography. In this work 2D MAS NMR experiments were carried out over a wide range of low temperatures (129-295 K) on a nonstandard high-resolution Solid State NMR equipment to obtain the first experimental determination of the effects of small-amplitude motions on C-13 Chemical Shift Tensors of a multi-carbon molecule (ibuprofen). (C) 2018 Elsevier B.V. All rights reserved.