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show weaker CH₄ absorption than previously discovered T-dwarfs. CH₄ appears first in the K-band in L8 dwarfs and L- and T-dwarfs are distinguished by the appearance of CH₄ in the H-band for T-dwarfs. T-dwarfs show an increasing absorption of H₂O and CH₄ from T0 to T8. Neutral Na and K features broaden in L- and T-dwarfs and the Na feature increases in depth for L/T-dwarfs with increasing spectral

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