Top: Earthshine polarization results at quadrature for maria (∗) and highlands (+). The thin lines give the Sterzik et al. (2012) spectro-polarimetry for waning (dashed) and waxing (dotted) moon at Earth phases 87° and 102°, respectively, and the Takahashi et al. (2013) spectro-polarimetry (dash-dot) at 96°. The circles are the Dollfus (1957) values q_max from Fig. 7 (filled) and two additional observations at Earth phase ≈ 100° (open). 2nd panel: Earth polarization p_E from Table 3 (⋄) compared to the POLDER/ADEOS results of Wolstencroft & Breon (2005) (×) and two Stam (2008) models with 40% (dash-dot) and 60% (dash-dot-dot) cloud coverage. Bottom two panels: spectral reflectivity of Earth f_E and polarized reflectivity of Earth p_E × f_E.