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Fig. 16.20
Mars exploration rover wheel tread on a ripple. Note the 'bulldozed' lobe of material, the crisp imprint of the rover wheel tread
pattern, the steep walls of the 'trench' and the radial fractures in the material indicating some cohesion. NASA/JPL PIA 1620543
Fig. 16.21
The Sojourner rover imaged by the Pathfinder lander in 1997. The rover has stopped atop a shallow ripple, nicknamed 'Mermaid',
where it used an APXS instrument to measure the sand composition. NASA/JPL/U.Arizona
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