Upper panel: same as Fig. 2, but zoomed on the optical region. The red line corresponds to the best weighted linear fit in the (lnλ,k) plane over all data points at λc < 1μm (ours and from Fukui et al. 2013) under the assumption of pure Rayleigh scattering; see text for details. Lower panel: instrumental passbands employed for each data point.
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