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Large contrast via different vertical axis ranges, between bare smooth ice (right) and course granular snow (left) in angular variations, from normal exit (top curve) to 75° exit (bottom curve) for spectral emissivity from 8 μm to 12.5 μm. The “free” total emissivity curve lies closer to higher exit angle curves (plots adapted from select data within Fig. 3 of Ref. ).
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