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Fig. 5

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Same as Fig. 4 for the H and K bands. Flux ratio of the (e) and (f) zones, and of the (g) and (h) zones define the spectral indices H2O–1.5 μm and H2O 2 used in Fig. 10. They vary only slightly with age from 1 Myr and can be used to confirm the spectral type of our targets.

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