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Fig. 3.

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Rotation period as a function of spectral type for all periodically variable M7-Y0 dwarfs known as of this writing. EQ J1959-3338 and 2MASS J09393548-2448279 are indicated by a red star. The position of the other two periodically variable T8 dwarfs (WISE J062309.94-045624.6 and Ross 458C) is also indicated. Literature values are taken from Tannock et al. (2021), Vos et al. (2022), Miles-Páez et al. (2023), Rose et al. (2023).

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