X-ray emission spectrum of a hot plasma - Commentary on: Mewe R., Gronenschild E. H. B. M., and van den Oord G. H. J., 1985, A&AS, 62, 197J. C. RaymondA&A, 500 1 (2009) 311-312DOI: https://doi.org/10.1051/0004-6361/200912166
