Doppler shift oscillations of a sunspot detected by CYRA and IRIS D. Li, X. Yang, X. Y. Bai, J. T. Su, Z. J. Ning, W. Cao and Y. Y. Deng A&A, 642 (2020) A231 Published online: 23 October 2020 DOI: 10.1051/0004-6361/202039007