Period distribution (number of binaries in a period bin) of the ejected massive binary systems for initially mass-segregated clusters with  pc. Figures in the left column are the clusters with an initial period distribution according to Sana et al. (2012) for massive binaries (Eq. (3)), while those in the right column are the clusters with the Kroupa (1995b) period distribution (Eq. (2)). The grey solid line indicates the initial distribution. Initial distribution and the distributions of systems that remain in their birth cluster are scaled to the total number of the ejected binary systems.