tokens: Acknowledgements SB is thankful to the anonymous referee for helpful comments that helped us improve some of the descriptions in this paper. SB is indebted to Sverre Aarseth of the Institute of Astronomy, Cambridge, for his efforts in improving nbody6/7 , without which this study would not have been possible. SB is thankful to Sverre Aarseth also for reading the manuscript and providing improvement suggestions. SB is thankful to the computing team of the Argelander-Institut fr Astronomie, University of Bonn, for their efficient maintenance of the workstations on which all the computations have been performed.
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