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tokens: Density maps were created with splash , by Price ( 2007 ). We thank the anonymous referee for useful comments that greatly helped us to improve the presentation of the paper. JC acknowledges support from CONICYT-Chile through FONDECYT (1141175), Basal (PFB0609) and Anillo (ACT1101) grants, and the warm hospitality at Leicester. Theoretical astrophysics research in Leicester is supported by an STFC Rolling Grant. QDW acknowledges the support by NASA via the SAO/CXC grant TM3-14006X. This work was performed using the Geryon computers at the Centre for Astro-Engineering UC, funded by Basal PFB-06, QUIMAL 130008 and Fondequip AIC-57.