  We report that the local Debye-Waller factor in a simulated 2D glass-forming
mixture exhibits significant spatial heterogeneities and that these short time
fluctuations provide an excellent predictor of the spatial distribution of the
long time dynamic propensities [Phys.Rev.Lett. 93, 135701 (2004)]. In contrast,
the potential energy per particle of the inherent structure does not correlate
well with the spatially distributed dynamics.
