where Table : The rotationally averaged traceless multipole moments (atomic units) of the linear acetonitrile molecule, MeCN, calculated using MP2/aug-cc-pVDZ. The rotational averages of the components of the multipole moments over the z axis are obtained using the expressions similar to Eq. 12. The origin of the coordinate system is located at the center of mass of the molecule. The index i runs over x, y, z.