Figure 21: Z and N of nuclei vs. matter density in an accreted crust, for different models of dense
matter. Solid line: ; dotted line: . Every change of N and Z, which takes place
at a constant pressure, is accompanied by a jump in density: it is represented by small steep (but not
perpendicular!) segments of the curves. These segments connect the top and the bottom density of a
thin reaction shell. Arrows indicate positions of the neutron drip point. From Haensel & Zdunik [187].
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