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Fig. 16

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Determination of Teff  of K 1−27 (left) and LoTr 4 (right) using the central emission of He iiλ 4686 Å. The EFOSC2 observation (solid black line) is compared with models with Teff  = 130/110 kK (dashed, blue), 135/120 kK (thick, green), and 140/130 kK (thin, red).

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