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Table 2

g magnitude of the stars and signal-to-noise ratio of the mean spectrum at different wavelengths.

S/N S/N S/N S/N
Star 395 nm 445 nm 588 nm 777 nm

SDSS
J1114+1828 50 70 60 100
J1143+2020 40 60 60 100
J2209–0028 17 30 30 48

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