Fig. 3

He I λ 4471 (left panel), He II λ 4542 (middle panel), and O III λ 5592 lines (right panel) of the recombined synthetic spectrum (red) of the triple system HD 17505A for different observations(black). The phases of the different observations, according to the ephemerides of Table 4, are presented on the right side of the figure. The normalized spectra are shifted upwards to improve the clarity of the plot.
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