The `LINCOMB` directive allows for the calculation of linear combinations of normal coordinates
for the expansion of the potential. This is realized by 2x2 Jacobi rotations. At most 3N-6/2
rotations can be provided in the input. Using an angle of 45 between the degenerate modes of non-Abelian
molecules avoids symmetry breaking in the subsequent `VSCF` and `VCI` calculations.

`NM1`=*n*,`NM2`=*m*- Denotes the normal coordinates to be rotated.
`ANGLE`=*value*- Rotation angle in degree.
`LOCAL`=*value*`LOCAL`=1 localizes the normal coordinates of the CH-stretchings. Note that this destroys symmetry of these modes. Usually localization has strong impact on subsequent`VSCF`calculations.`LOCAL`=2 localizes the normal coordinates of a molecular cluster to the contributing entities. This localization scheme localizes within the individual irreps, which usually leads to a very faint localization. Switching symmetry off by`MPG`=1 in the`SURF`program leads to a much stronger localization.`LOCAL`=3 is a combination of`LOCAL`=1 and`LOCAL`=2.

molpro@molpro.net 2019-03-19