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Fig. 3

image

Phase function of asteroid (673) Edda. The top panel shows the original measurements in cyan and orange filters; the brightness (relative flux) was normalized to a unit distance from the Sun and Earth, and outliers were removed. The vertical shift between two filters corresponds to the color index co = 0.402 mag. On the bottom panel, the rotation and geometry effects were removed and the solid curves correspond to phase-angle functions according to Eq. (2) with different slope parameters kc and ko. The scatter of points around the mean phase curves corresponds to residuals of the fit.

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