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Takafumi Haga∗†,1 Akhiro Doi,2 Yasuhiro Murata,2 Hiroshi Sudo,3 Seiji Kameno,4 and Kazuhiro Hada5 1 Department of Space and Astronautical Science, The Graduate University for Advanced Studies (SOKENDAI) 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan 2 Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan 3 Department of Mathematical and Design Engineering, Faculty of Engineering, Gifu University 1-1 Yanagido, Gifu City 501-1193, Japan 4 Department of Physics, Faculty of Science, Kagoshima University 1-21-24, Korimoto, Kagoshima 890-8580, Japan 5 INAF Istituto di Radioastronomia via Gobetti 101, 40129 Bologna Italy

The structure of the circumnuclear absorber in NGC 4261 by multi-frequency phase-referencing observation