Binned distributions of the initial inner and outer semimajor axis (blue and orange lines). The dashed lines (normalised to unity) reflect the parent distributions from which we draw the semimajor axes. The solid lines shows the subset of systems that are dynamically stable and that are used in the simulations. From top to bottom: model OBin, T14 and E09 are shown. Bottom panel: distribution of semimajor axes that are commonly used for isolated binaries.