High-resolution imaging and near-infrared spectroscopy of penumbral decay M. Verma, C. Denker, H. Balthasar, C. Kuckein, R. Rezaei, M. Sobotka, N. Deng, H. Wang, A. Tritschler, M. Collados et al. (2 more) A&A, 614 (2018) A2 Published online: 06 June 2018 DOI: 10.1051/0004-6361/201731801