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Fig. 1.

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Portion of the HARPS-N and GIANO-B spectra in the V, R, Y, J, H, and K bands for three representative RSGs observed in the Perseus complex. Spectra are corrected for telluric contamination and RV, and they are plotted in order of increasing stellar temperature from the bottom to the top. In each panel, the normalized spectra of the three stars are shifted by a constant.

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