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We investigate the potential of a future supernova dataset, as might be obtained by the proposed SNAP satellite, to discriminate among different "dark energy" theories that describe an accelerating Universe. We find that many such models can be distinguished with a fit to the effective pressure-to-density ratio, $w$, of this energy. More models can be distinguished when the effective slope, $dw/dz$, of a changing $w$ is also fit, but only if our knowledge of the current mass density,doi:10.1103/physrevlett.86.1939 pmid:11289825 fatcat:e4jltr45krhvbimwligztpcf4q