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Fig. 2

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NIR spectrum of candidate C1 in the ranges 1.6–1.75 μm (left panel) and 2.04–2.2 μm (right panel) showing the identified lines, among which we found H i and He i lines typical of early-type stars. The horizontal solid line delineates the position of the continuum, while the dashed lines indicate the 2σ uncertainties. The rest of the spectrum (see Table 3) is not shown because its faintness prevented us from extracting useful data.

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