In our Letter, we used the damped harmonic-oscillator function  as a scattering function for phonon modes: However, in the fits to the data, accidentally a modified scattering function which differs from Eq. (1) by its denominator (Formula Presented) was used. We corrected the scattering function and show the refitted results in Fig. 1. The measured data are well reproduced by these new fits. (Figure Presented).