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Siviero (7), Danfeng Xiang (1), Fang Huang (6, G. Terreran (9), Han Lin (1), Hao Song (1), Hongbin Li (4), J. Craig Wheeler (2), Jianrong Shi (4), Jinming Bai (3), JuJia Zhang (3), Kaicheng Zhang (1, Liming Rui (1), Linyi Li (1), L. Tartaglia (8), L. Tomasella (5), N. Elias-Rosa (5), P.Ochner (5, S. Benetti (5), S. Taubenberger (10, Tianmeng Zhang (4), U. Munari (5), Wenxiong Li (1), Xiaofeng Wang (1), Xiaojun Jiang (4), Xulin Zhao (12), Zhenyu Wu (4) (1.Tsinghua University","submitted_at":"2018-08-20T05:37:26Z","abstract_excerpt":"We present extensive spectroscopic observations for one of the closest type Ia supernovae (SNe Ia), SN 2014J discovered in M82, ranging from 10.4 days before to 473.2 days after B-band maximum light. The diffuse interstellar band (DIB) features detected in a high-resolution spectrum allow an estimate of line-of-sight extinction as Av=1.9+/-0.6 mag. 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