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The simplest possibility consists of a cosmological scalar field $\\varphi$, dubbed quintessence, driving the accelerated expansion. We assess the evidence for the existence of such a scalar field. We find that, if the accelerated expansion is driven by quintessence, the data favour a potential energy $V(\\varphi)$ that is concave, i.e., $m^2=d^2V/d\\varphi^2<0$. 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