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Q2-dependence of the HWHM values in SH-D (Q, ω) obtained by profile fitting to Equations (2) and (3). The values of Γslow at 238 K (purple), 253 K (blue), 268 K (green), and 283 K (red) relate to the left axis, while that of Γfast at 283 K (pink) relates to the right axis. The broken curves of Γslow and Γfast are the fitted results obtained using the jump-diffusion model [30].
