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. 2023 Sep 13;9(37):eadh4302. doi: 10.1126/sciadv.adh4302

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Fig. 2. — Colored patches show the extent of PSRs for maximum solar declinations of 1.5° (blue, close to current), 3° (green, 2.1 Ga ago), and 6° (red, 3.3 Ga ago) in polar stereographic projection for the south and north polar regions with present-day topography. The background grayscale map is maximum direct solar irradiance for the present day.