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Fig. 4
(z − H, Y − H) colour–colour diagram for our targets (filled dots and arrows for lower limits), UGPS J0722227.51 − 054031.2 (open triangle with the error bars; Lucas et al. 2010), and the known T9, CFBDSIR 145829.0 + 101343.0 (open triangle; Delorme et al. 2010).
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