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3 almucantar observations at 427.8 ± 5 nm (March 8, 2019): observations (in blue) and predictions for the model that best fits the data (Black stars ★). The model is a linear combination of ground and sky (including albedo) for a 6% polarised sky emission in a direction defined by an azimuth of 50° and 10° elevation (see text for details). The dashed vertical black line indicates the direction of Skibotn. The picture of the sky at 557.7 nm is shown in Appendix A.
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