Observation of spectral lines in the exceptional GRB 221009A

Yan-Qiu Zhang, S. L. Xiong, J. Mao, Shuang‐Nan Zhang, W. C. Xue, Chao Zheng, Jia-Cong Liu, Zhen Zhang, Xilu Wang, M. Y. Ge, Shu-Xu Yi, Li-Ming Song, Zhenghua An, Ce Cai, Xinqiao Li, Wen-Xi Peng, Wenjun Tan, Chen-Wei Wang, Xiang-Yang Wen, Yue Wang, Shuo Xiao, Fan Zhang, Peng Zhang, S. J. Zheng