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This article has an erratum: [https://doi.org/10.1051/0004-6361/201629711e]


Fig. 3

image

Spectral index as a function of the wavelength for the studied samples: X35 (upper left panel), X40 (upper right panel), X50A (lower left panel) and X50B (lower right panel). For each sample, the spectral index is displayed for different temperatures: 300 K (red), 100 K (green) ans 10 K (blue). The value of the spectral index was derived from a 6th order polynomial fit of the measured MAC.

This figure is made of several images, please see below:

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