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The equation of state of dark energy is investigated to determine how much itmay deviate from the equation of state of the cosmological constant (CC). Twoaspects of the problem are studied: the "expansion" around the vacuum equationof state and the problem of the crossing of the cosmological constant boundary.Comment: 7 pages, 3 plots, talk given at the DSU2006, International Workshop  on the Dark Side of the Universe, Madrid, Spain, 20-24 Jun 200

Dark-energy equation of state: how far can we go from Λ?