Fig. 13
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Joint distribution of the FWHM of DIBs λ862.1 and λ864.8, measured in 9778 stacked ISM spectra, with S/N > 100 and 𝒟 > 3RC (see Sect. 4.2), generated by a Gaussian kernel density estimation (KDE). The white star indicates the peak density, and the red line in the central panel indicates the contour of the 2σ level. The orange lines indicate the median FWHM of the two DIBs.
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