Fig. 4
Chi-squared from the comparison between the X-shooter spectra of USco 1610-1913 B, HIP 77900 B, and HIP 78530 B to the optical spectra of the Ultracool RIZzo spectral library. We indicate the best-fitting object for each group in blue. The χ 2 minimum for all objects is represented in red. (a) : Cruz et al. (2003). (b) : Reid et al. (2008).
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