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Fig. 8
Sequence of optical spectra of USco16m25 taken with WHT/ISIS over the course of 1.5 month, between 2 June and 14 July 2015. The wavelength range spans 745–845 nm at a spectral resolution of ~6000 (left plot), which includes the gravity-sensitive sodium (818.3/819.5 nm; right-hand side plot) doublets at 818.3/819.5 nm.
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