The s-process path in the region of interest in the chart of the nuclides. Isotopes represented by white boxes are stable, isotopes represented by black boxes are unstable. The black arrows indicate the s-process path. The solid arrows indicate the s-process path branches specific to low neutron densities. The dashed arrows indicate the s-process path branches followed under high neutron densities. The rectangular box encircles isotopes with magic neutron number N = 50. These isotopes have relatively small neutron capture cross sections.