Table 8. Variations of Vibrational Frequencies (in cm^–1) with Pressure (GPa) for N = 3 and N = 6 Parameters^a.

			N = 3
freq	symm	g̃iij
346.9	T2u	–10.5	2.39	–0.19	0.18	2.58
517.5	T2g	–34.5	1.98	0.38	0.59	1.59
611.3	T1u	–37.0	1.14	0.5	0.64	0.63
662.4	Eg	–76.5	1.92	1.22	1.31	0.70
771.2	A1g	–98.5	2.38	1.62	1.70	0.76
978.5	T1u	–108.5	0.65	2.15	1.87	–1.50

			N = 6
freq	symm	g̃iij
346.9	T2u	–10.5	1.83	–0.12	0.15	1.95
517.5	T2g	–34.5	1.55	0.31	0.47	1.24
611.3	T1u	–37.0	1.00	0.37	0.50	0.63
662.4	Eg	–76.5	1.65	0.96	1.04	0.70
771.2	A1g	–98.5	1.87	1.29	1.35	0.58
978.5	T1u	–108.5	1.14	1.61	1.48	–0.47

^aFreq and symm refer to normal mode frequencies (in cm^–1) and symmetries, respectively. g̃_iij represents the cubic force constant (in cm^–1). cur and rel subscripts indicate the curvature and relaxation terms, while anal and num superscripts refer to the calculation approaches.