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MAMMOTH-1 nebula is an enormous Ly$\\alpha$ nebula (ELAN), hosted by a type-II quasar dubbed MAMMOTH1-QSO, that extends over $1\\ h^{-1}$ cMpc with not fully clear physical origin. Here we investigate the HI-gas distribution around MAMMOTH1-QSO with the ELAN and three neighbouring type-I quasars, making the IGM HI tomography map with a spatial resolution of $2.6\\ h^{-1}$ cMpc. Our HI tomography map","authors_text":"Akio K. Inoue, Haibin Zhang, John D. Silverman, Joseph F. Hennawi, J. 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