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+From https://www.naturalearthdata.com/about/terms-of-use/
+
+All versions of Natural Earth raster + vector map data found on this
+website are in the public domain. You may use the maps in any manner,
+including modifying the content and design, electronic dissemination,
+and offset printing. The primary authors, Tom Patterson and Nathaniel
+Vaughn Kelso, and all other contributors renounce all financial claim to
+the maps and invites you to use them for personal, educational, and
+commercial purposes.
+
+No permission is needed to use Natural Earth. Crediting the authors is
+unnecessary.
+
+iowever, if you wish to cite the map data, simply use one of the
+following.
+
+Short text:
+Made with Natural Earth.
+
+Long text:
+Made with Natural Earth. Free vector and raster map data @
+naturalearthdata.com.