Fig. 2
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Normalised J - and H-band spectra of four newly classified OB members of Westerlund 1, offset vertically for clarity. Object IDs and adopted spectral types are indicated on the left. Principal diagnostic lines used for the spectral classification include Pa δ, Pa γ, He I 1.083 μm, He I 1.092 μm, He I 1.278 μm, Br 10-12, He II 1.692 μm, and He I 1.700 μm.
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