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Fig. 3

image

Inverse correlation between log(A) and log (Pmax), i.e., the Umov effect, as measured in 21 different sites on the Moon in blue and red light, shown with blue triangles and red points, correspondingly (data adapted from Shkuratov & Opanasenko 1992), and their linear fit plotted as the black solid line, which is computed with Eq. (6). The black square corresponds to Phaethon.

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