ner_tags: O O O O O O O O O O O O O O B-Person I-Person I-Person O O O O O O B-CelestialObject I-CelestialObject O B-Person I-Person O O O O O O O O O O O O O B-Organization B-Grant B-Grant O B-Grant
tokens: The author thanks the anonymous referee for helpful comments that helped improve this work, A. P. Milone for providing the observed data of NGC 1866, and Daniel Kister for help in improving the English, and also acknowledges the support from the NSFC 11773005, U1631236, and 11273012.