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Fig. 3. Colour photographs (without polarizers) of the mirror image of the clear sky reflected from the black water-dummy (glass pane underlaid by matt black cloth), patterns of the degree (d) and angle ({alpha}; measured from the local mirror meridian) of linear polarization of reflected skylight, and the area detected polarotactically as water versus the solar elevation ({theta}s) and time (local solar time = UTC + 2 h). See Fig. 2 for further details.





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