Profiles of the particle fractions Y_i ≡ n_i/n_B (upper plots) and baryon mass density ρ_B (lower plots) for the collapse of a 40 M_⊙ star, where n_i represents the number density of particle i, and n_B the baryon mass number density. For the upper plots of all panels, dotted, dot-dashed, long-dashed, short-dashed, and solid lines correspond to neutron, proton, u quark, d quark, and s quark, respectively. The panels in the top row are for the case with B = 90 MeV fm^-3, and left, central, and right plots, respectively, show the profiles at 0 ms, 100 ms, and 142.19 ms after the bounce. The panels in the bottom row are for the case with B = 250 MeV fm^-3, and left, central, and right plots, respectively, show the profiles at 0 ms, 1085.45 ms, and 1085.52 ms after the bounce. We note that, the upper-right and lower-right panels correspond to the moment of black hole formation for each case, and thin dotted vertical lines show the location of the apparent horizon.