Maps of topography referenced to the geoid and expanded to spherical harmonic degree and order 6, overlain with the fluvial features employed in this study. This material relates to a paper that appeared in the 19 May 2017, issue of Science, published by AAAS. The paper, by B.A. Black at City University of New York in New York, NY, and colleagues was titled, "Global drainage patterns and the origins of topographic relief on Earth, Mars, and Titan."
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