Comparison of spectra for 2M2033 and theoretical models from the BT-Settl CIFIST library. Upper panels: observed flux in black where we have binned the observed flux into wavelength slices of five for a better signal-to-noise ratio, obtaining a wavelength resolution of Δλ = 25 Å, and using the standard deviation from the mean of the bins as the uncertainty, shown by the gray-shaded areas. The red lines depict the best-fit theoretical model, here with Teff = 1600−100 K and . Lower color-map: relative goodness-of-fit values for the different models tested, where blue represents poor fits and red represents good fits, and the best fit with uncertainty included is illustrated by the black marker and ellipse.
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