Fig. 6

image

Variation of fscattftherm (1 AU; deduced from the ratio of the radiances at 2.44 and 4.6 μm, see text) with elevation H for α = 83–90°. The color-coding and symbols are the same as for Fig. 5. Data with TEST3.0 < 1.35 are considered. The dash-dotted and dashed lines correspond to a power-law fit for data obtained between –71 and –10 d with respect to perihelion (∝ H+0.31) and between –2 and 21 d (∝ H+0.22), respectively.

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