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tokens: We would like to thank the anonymous referee for the useful comments and suggestions which helped improve this paper. NPM and FAG would like to thank Monica Valluri for the very interesting discussion and useful comments that help to improve this manuscript. NPM, FAG, PMC and CMG are grateful to Carles Simó for his illuminating discussions, comments and suggestions. We are also grateful to Volker Springel, Simon White and Carlos Frenk for generously allowing us to use the Aquarius simulations. Finally, NPM wants to thank D. D. Carpintero, F. Bareilles and E. Suárez for their assistance with the lp-vicode as well as with the pre-processing of the data. NPM, PMC and CMG were supported with grants from the Consejo Nacional de Investigaciones Científicas y Técnicas (IALP UNLP–CONICET) de la República Argentina (CCT-La Plata) and the Universidad Nacional de La Plata (FCAG UNLP). FAG and BWO acknowledge support from the US NSF Office of Cyberinfrastructure by grant PHY-0941373 and by the Michigan State University Institute for Cyber-Enabled Research (iCER). BWO was supported in part by NSF grants PHY-0822648 and 1430152: Physics Frontiers Center/Joint Institute for Nuclear Astrophysics (JINA). APC is supported by a COFUND/Durham Junior Research Fellowship under EU grant [267209].