Table A8.

Non-vanishing quartic energy derivatives K_sstu with respect to and their symmetry relations⁶⁰

Symmetry	w.r.t.		Group	N
			II
			II
			II
			II
			II
			II
			II
			II
			II
			II

c_i is the subscript labelling the degenerate representation of mode i, for example c_i = 1 for E or E₁, c_i = 2 for E₂, etc. p is a non zero integer number and N indicates the order of the principal symmetry axis. For I and II Group classification see Table A1.