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The w-w' plane, defined by the equation of state parameter for the darkenergy and its derivative with respect to the logarithm of the scale factor, isuseful to the study of classifying the dynamical dark energy models. In thisnote, we examine the evolving behavior of the two-field quintom models with wcrossing the w=-1 barrier in the w-w' plane. We find that these models can bedivided into two categories, type A quintom in which w changes from >-1 to <-1and type B quintom in which w changes from <-1 to >-1 as the universe expands.Comment: 5 pages, 2 figures, RevTeX, Accepted for publication as a Brief  Report in Physical Review

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Two-field quintom models in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>w</mml:mi><mml:mo>−</mml:mo><mml:msup><mml:mi>w</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math>plane

Two-field quintom models in thew−w′plane