An atlas of spectra of B6–A2 hypergiants and supergiants from 4800 to 6700 Å E. L. Chentsov, S. V. Ermakov, V. G. Klochkova, V. E. Panchuk, K. S. Bjorkman and A. S. Miroshnichenko A&A, 397 3 (2003) 1035-1042 Published online: 21 January 2003 DOI: 10.1051/0004-6361:20021430