Fig. 8
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GTC/OSIRIS upper limit on the pEW of the Cs I resonance line (8521 Å) of W1738 compared with the measurement in the T9 dwarf UGPS0722, the upper limit on the Y dwarf W2056, and measurements in other ultracool dwarfs from the literature. The combined upper limit for Y dwarfs was obtained from the sum of the W1738 and W2056 spectra.
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