tokens: We thank Alessandro Morbidelli, Steven N. Shore and David Nesvorný for helpful discussions during this project. We are very grateful to Bertram Bitsch who kindly provided his code for calculating the migration maps. We also thank an anonymous referee for valuable comments. The work of O.C. and M.B. has been supported by Charles University in Prague (project GA UK No. 128216; project SVV-260441). The work of M.B. was supported by the Grant Agency of the Czech Republic (grant No. 13-01308S). Access to computing and storage facilities owned by parties and projects contributing to the National Grid Infrastructure MetaCentrum, provided under the program “Projects of Large Research, Development, and Innovations Infrastructures” (CESNET LM2015042), is greatly appreciated.
ner_tags: O O B-Person I-Person B-Person I-Person I-Person O B-Person I-Person O O O O O O O O O O O B-Person I-Person O O O O O O O O O O O O O O O O O O O O O O B-Person O B-Person O O O O B-Organization I-Organization O B-Location B-Grant I-Grant I-Grant I-Grant I-Grant B-Grant I-Grant O O O B-Person O O O O B-Organization I-Organization I-Organization I-Organization I-Organization I-Organization B-Grant I-Grant I-Grant O O O O O O O O O O O O O O B-ComputingFacility I-ComputingFacility I-ComputingFacility I-ComputingFacility O O O O B-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant B-Grant I-Grant O O O