Implications of the mild gas motion found with Hitomi in the core of the Perseus clusterLiyi Gu, Kazuo Makishima, Ryoji Matsumoto, Kazuhiro Nakazawa, Kazuhiro Shimasaku, Naohisa Inada, Tadayuki Kodama, Haiguang Xu and Madoka KawaharadaA&A, 638 (2020) A138DOI: https://doi.org/10.1051/0004-6361/201936437