Comparison of the fractional polarization of Earth in dependency of phase angle (Sun – Earth – Moon) with models in B, V, R, and I bandpasses. The error bars indicate the effects of uncertain lunar albedo on polarization. The phase curves for three representative models of Stam (2008) are overplotted with different line styles. Values extracted from the simulated spectra of Emde et al. (2017) for observation IDs A.3 and B.4 are indicated by stars.