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In this paper we study the possibility of building models of dark energy withequation of state across -1 and propose explicitly a model with a single scalarfield which gives rise to an equation of state larger than -1 in the past andless than -1 at the present time, consistent with the current observations.Comment: 4 pages, 1 figure, the version accepted by JCAP, presentation  improved and references adde

A single scalar field model of dark energy with equation of state crossing −1