Fastest rate plotted given a temperature of 1 × 10⁹ K and a neutron density of 1 × 10³⁰ cm^-3. The contour lines indicate when the probability of β-delayed emission of n neutrons reaches 50%. The neutron drip line and the locations of the proton and neutron magic numbers are denoted with black solid lines. The location of the stable nuclei are denoted by the black squares. A color version of this figure is available in the online article.