Fig. 1
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Color-magnitude diagram of the field brown dwarfs (M, L, and T dwarfs are shown in color), objects with confirmed youth or low gravity, and well-known directly imaged exoplanets (photometry from the UltracoolSheet, Best et al. 2024). GJ 504 b is at a unique position between the sequence of young low-gravity objects and old T-type brown dwarfs.
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