Fig. 4
Relative reflectance spectrum of comet 152P (grey dots). For comparison, a synthetic spectrum of amorphous carbon (AC) grains (particle diameter of 5 μm, blue line) and the synthetic spectrum used to represent the Hartley 2 coma (solid red line) composed of 1 μm water-ice grains and dust not in thermal equilibrium (Protopapa et al. 2014).
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