Fig. 9

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Degree of linear polarization as a function of phase angle α. Top panel: agglomerated debris particles with five different refractive indexes (see legend) that are representative of Mg-rich silicates with a different iron content and organic matter in red light. Bottom panel: polarimetric responses measured in comet C/2013 X1 (PANSTARRS) and the four best fits obtained using the two-component model. All modeling results were obtained using polydisperse particle systems with a power-law size distribution with index n = 2.3.
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