ner_tags: O O B-Person I-Person O O O O O O O O O O B-Person O O O O O O O O O O O O O O O O O O O O O
tokens: I thank Alexei Butkevich for help in providing me with the relevant chapter in Eddington’s rare 1914 book and for discussions on different aspects of the Malmquist bias. Good remarks by the referee are also acknowledged.