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Fig. 6

image

Observed Si IV λλ1394, 1403 doublet (blue solid line) compared to synthetic spectra for Aa and Ab. In the upper panel, the temperature of the primary is varied, while the secondary’s temperature is fixed at 45 kK. In the lower panel, the secondary’s temperature is varied, while the primary’s temperature is fixed at 52 kK. The red dashed lines always indicate the adopted final model.

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