Phonon density of states for hcp terbium

D(ω) [10¹⁵ s/rad m^-3]
	ω [10¹² rad/s]

The atomic density is taken to be 3.13×10²⁸ m^-3. Each atom has three degrees of freedom so the integral over all frequencies is 3×3.13×10²⁸ m^-3. The data is from doi: 10.1007/b19988.

T = 298 K