Schematic picture of ρ– T plane characterizing our pseudo-flashing method. Region I almost consists of nickel, region II contains α-particles and free nucleons, and in region III all nuclei and α-particles are dissolved into free nucleons. In region IV we resolve the nuclear network to evolve the chemical compositions. See Rampp & Janka (2002) for details. We take three flows (A, B, and C) as representations of mass shells in the LC15 model.