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tokens: We thank the referee Durgesh Tripathi for useful suggestions. We also thank Linhua Deng for providing us with the NVST data, Rui Liu for helpful discussions, and the ISSI workshop on “Decoding the Pre-Eruptive Magnetic Configuration of Coronal Mass Ejections” led by S. Patsourakos and A. Vourlidas. SDO is a mission of NASAs Living With a Star Program. X.C. and M.D.D. are supported by NSFC under grants 11722325, 11733003, and 11790303 and by Jiangsu NSF under grant BK20170011. X.C. is also supported by the “Dengfeng B” program of Nanjing University. B.K. acknowledges support by NASA under Grants NNX16AH87G and 80NSSC17K0016, the NSFC, and the DFG.