Re-detection and a possible time variation of soft X-ray polarization from the Crab

Hua Feng, Hong Li, Xiangyun Long, R. Bellazzini, E. Costa, Qiong Wu, Jiahui Huang, Weichun Jiang, M. Minuti, Weihua Wang, Renxin Xu, Dongxin Yang, L. Baldini, Saverio Citraro, Hikmat Nasimi, P. Soffitta, Fabio Muleri, Aera Jung, Jiandong Yu, Ge Jin, Ming Zeng, Peng An, A. Brez, L. Latronico, C. Sgrò, G. Spandre, Michele Pinchera