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We use the Riess et al. (2004) 1 supernova Ia apparent magnitude versus redshift data and the Allen et al. (2004) 2 galaxy cluster gas mass fraction versus redshift data to constrain dark energy models. These data provide complementary constraints that when combined together significantly restrict model parameters and favor slowly-evolving dark energy density models, close to the Einstein cosmological constant limit of dark energy.
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Wilson et al. (2006) studied this question.
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