Reduced bispectrum, Qeq(k) = Beq(k)/ [3P(k)2] , for equilateral configurations, at redshifts z = 0.35,1, and 3. The points are the results from the numerical simulations and the solid line is our “direct” model, as in Fig. 8. The black dashed line is the lower tangent to the “direct” curve Qeq(k), on the transition region. It defines the two contact points of abscissa k− and k+, shown by the two small vertical lines, between which we introduce the two modifications “tang.” (green dot-dashed line) and “flat” (blue dashed line), explained in the main text.
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