Fig. 3. Phonon linewidths as a function of mode energy (<2000 cm⁻¹ only) at unique q-points for (a) compound 1 with a 3 × 3 × 3 sampling mesh at 300 K (r_cut = 7 Å), and (b) [Dy(bbpen)Br] with a 2 × 2 × 2 sampling mesh at 300 K.¹¹ Values for different unique q-points are shown by different markers and colours.