Dealing with data gaps for TianQin with massive black hole binary signal Lu Wang, Hong-Yu Chen, Xiangyu Lyu, En-Kun Li and Yi-Ming Hu Eur. Phys. J. C, 85 2 (2025) 120 Published online: 31 January 2025 DOI: 10.1140/epjc/s10052-025-13810-0