We examine the thermodynamics of supercooled liquids focusing on the immediate vicinity of an onset temperature, TA, where system dynamics just begin to experience caging effects. Simulation data from a polymer model and from small molecule mixtures show, in agreement with experiment, that the configurational entropy becomes strongly temperature dependent below TA. Since the diffusion coefficient follows the Adam-Gibbs relationship, our results clearly establish a thermodynamic connection to the localized dynamics of glass-forming liquids.

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