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Fig. 8
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Distribution of the S/N of the stacked ISM spectra in the DIB depth-width plane (𝒟 vs. σDIB) for DIBs λ862.1 and λ864.8, respectively. The colour represents the mean S/N in each 0.001 × 0.003 nm bin for λ862.1 and 0.001 × 0.01 nm bin for λ864.8.
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