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Fig. A.1
Identification chart of bright stars near Simeis 57 for which continuum spectra are shown in Fig. A.2. The red cross denotes star No. 16 (HD 193793/WR140 aka the spectroscopic binary SBC9 1232 (Pourbaix et al. 2004)), which is the most likely candidate for the exciting star of Simeis 57. Background map is as in Fig. 1.
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