tokens: Acknowledgements We wish to thank Jay Anderson for helping us quantify the additional uncertainty introduced by the 180° rotation between epochs. Thanks also to Bo Reipurth for helpful conversations. MR would like to thank John Bieging, Tom Haworth and Chris Miller. HH numbers are assigned by Bo Reipurth in order to correspond with the catalogue of HH objects maintained at http://ifa.hawaii.edu/reipurth/ ; see also Reipurth Reiter (2017), A General Catalog of Herbig-Haro Objects , 3rd Edition, in preparation. Support for this work was provided by NASA through grants AR-12155, GO-13390 and GO-13391 from the Space Telescope Science Institute. This work is based on observations made with the NASA/ESA Hubble Space Telescope , obtained from the Data Archive at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These HST observations are associated with programmes GO 10241, 10475, 13390 and 13391.
ner_tags: 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 B-Person I-Person O O O B-Person O O O O B-Person I-Person B-Person I-Person O B-Person I-Person O O O O O B-Person I-Person O O O O O O O O O O O O B-URL O O O B-Citation I-Citation I-Citation B-Dataset I-Dataset I-Dataset I-Dataset I-Dataset I-Dataset I-Dataset I-Dataset I-Dataset O O O O O O O O O B-Organization O B-Grant I-Grant B-Grant O B-Grant O O B-Organization I-Organization I-Organization I-Organization O O O O O O O O O B-Organization B-Telescope I-Telescope I-Telescope O O O O B-Archive I-Archive O O B-Organization I-Organization I-Organization I-Organization O O O O O B-Organization I-Organization I-Organization I-Organization I-Organization I-Organization I-Organization I-Organization O B-Organization B-Grant I-Grant I-Grant O B-Telescope O O O O B-Grant I-Grant I-Grant B-Grant B-Grant O B-Grant