tokens: This work was made possible by the efforts of Gerard Lemson and colleagues at the German Astronomical Virtual Observatory in setting up the Millennium Simulation database in Garching. We acknowledge useful discussions with participants of the Shanghai Assembly Bias workshop in the final stages of this work. We thank the anonymous referee for helpful comments that improved the presentation of the paper. I.Z., S.C., E.J., and N.P. acknowledge the hospitality of the ICC at Durham University. I.Z. and S.E.K. acknowledge support by NSF grant AST-1612085. S.C. is supported by a Juan de la Cierva Formacion Fellowship (FJCI-2017-33816). E.J. acknowledges support from “Centro de Astronomía y Tecnologías Afines” BASAL 170002. N.P. acknowledges support from Fondecyt Regular 1191813. This project received financial support from the European Union’s Horizon 2020 Research and Innovation programme under the Marie Sklodowska-Curie grant agreement number 734374.
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