Erratum: Continuum in the Spin-Excitation Spectrum of a Haldane Chain Observed by Neutron Scattering inCsNiCl3[Phys. Rev. Lett.PRLTAO0031-900787, 017202 (2001)]

There was a slight error in calculating the nonlinear sigma-model prediction for the 2-magnon scattering continuum shown in Fig. 2 of cond-mat/0010049, and Phys. Rev. Lett. {\bf 87}, 017202 (2001). Present erratum explains what was incorrect, and shows a corrected version of the figure. The correction is minor and does not affect main conclusions drawn in the original paper.