ner_tags: O O O O O O O O O O O O O O O O O O O O B-Person O O O O B-Observatory I-Observatory I-Observatory B-Fellowship I-Fellowship O O B-Fellowship I-Fellowship I-Fellowship I-Fellowship I-Fellowship I-Fellowship I-Fellowship I-Fellowship I-Fellowship I-Fellowship B-Fellowship I-Fellowship O B-Organization I-Organization O O O O B-Person B-Person O O O O O O O B-Fellowship I-Fellowship
tokens: We thank the referee for a careful reading of the manuscript and for suggesting the inclusion of Table 2 . I.D. is supported by the Harvard College Observatory Menzel Fellowship and the Natural Sciences and Engineering Research Council of Canada Postdoctoral Fellowship (NSERC PDF-421224-2012). The Smithsonian Institution supports the research of M.J.G. H.J.Z. gratefully acknowledges the generous support of the Clay Fellowship.