SN 1987A: Tracing the flux decline and spectral evolution through a comparison of SRG/eROSITA and XMM-Newton observationsC. Maitra, F. Haberl, M. Sasaki, P. Maggi, K. Dennerl and M. J. FreybergA&A, 661 (2022) A30DOI: https://doi.org/10.1051/0004-6361/202141104