Fig. 2
z − J (left) and z − H (right) colours of Y0 dwarfs (filled dots for detections and arrows for lower limits) as a function of spectral type compared to the colours of late-T dwarfs from UKIDSS (diamonds; Burningham et al. 2010b), Sloan (asterisks; Golimowski et al. 2004; Knapp et al. 2004; Chiu et al. 2006), Canada-France brown dwarf survey (squares; Albert et al. 2011), and the sample of Leggett et al. (2013, triangles).
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