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This paper uses wide-area monitoring system (WAMS) recordings of dynamic events to assess the validity of large-scale time-domain stability simulations. In 2003 there were four power system monitors installed in the Energy transmission network ranging from Arkansas to New Orleans. We compared real and simulated measurements for a small set of events which had known causes. We applied an event location algorithm to the real and simulated frequency measurements. The actual frequency change resulting from a loss of generation event is about twice as large as that predicted by the model. We also observed that the simulation model was more oscillatory than the actual system.