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Comparison of HD 191 201 spectra for the He I λ4922 region that highlights the importance of combining spatially and spectrally resolved information to analyze multiple systems. The two bottom plots show the spatially resolved, rectified, and normalized GOSSS spectra of HD 191 201 A and B, respectively (all plots are offset by 0.1 continuum units with respect to the adjacent ones). The middle plot is a linear combination of the bottom two (using the measured Δm) to simulate the A+B spectrum, note how the B component leaves just a small imprint around λ ≈ 4922 Å due to its relative faintness. The top plot shows a LiLiMaRlin spectrum of A+B taken at a similar phase as the GOSSS spectra and the one below it is the same spectrum degraded to the GOSSS spectral resolution. Note the similarity between the two spectra of A+B at R = 2500 but the different paths taken to obtain them.
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