In-orbit background of X-ray microcalorimeters and its effects on observationsS. Lotti, D. Cea, C. Macculi, T. Mineo, L. Natalucci, E. Perinati, L. Piro, M. Federici and B. MartinoA&A, 569 (2014) A54DOI: https://doi.org/10.1051/0004-6361/201323307