In 2004, the polarizability volume reported was modified by the use of additive corrections.
In STATIC, 37 or 38 SCF calculations are involved. The polarizability involves 36 calculations, one for each electric field. The fields are +X, -X, +2X, -2X, +Y, -Y, +2Y, -2Y, +X+Y, -X+Y, -X-Y, +X-Y, +2X+2Y, -2X+2Y, -2X-2Y, +2X-2Y, +Z, -Z, +2Z, -2Z, +X+Z, -X+Z, -X-Z, +X-Z, +2X+2Z, -2X+2Z, -2X-2Z, +2X-2Z, +Y+Z, -Y+Z, -Y-Z, +Y-Z, +2Y+2Z, -2Y+2Z, -2Y-2Z, and +2Y-2Z. These are used in the construction of a three by three secular matrix, which is then diagonalized, giving the orthogonal polarizabilities.