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    "excerpt": "This image shows a cross-section of ancient canyon systems in east Coprates Chasma."
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  "identifier": "ESP_052737_1645",
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		"text": "HiPOD: THURSDAY, 17 OCTOBER 2019"
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		"text": "Enigmatic Canyon Dunes"
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          "accessibilityCaption": "A narrated and close-captioned clip of this observation. Narration by Tre Gibbs."
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		"text": "<p><br />This image shows a cross-section of ancient canyon systems in east Coprates Chasma, and displays several orders and generations of wind-driven dunes and ripples, also called bedforms. Some areas display more modern bedforms, often termed mega-ripples, which have likely been active over long timescales and have migrated in the recent past.<br /></p>"
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		"text": "<p>Other areas along the canyon wall have larger bedforms that show a very different appearance. Although they have a spacing that would make them similar to typical Martian sand dunes, many display superposed craters, indicating they have not migrated for a very long time, possibly hundreds of thousands of years.<br /></p>"
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		"text": "<p>NASA/JPL/University of Arizona<br />ID: <a href='https://uahirise.org/ESP_052737_1645'>ESP_052737_1645</a><br></p>"
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		"text": "Black and white is less than 5 km across; enhanced color is less than 1 km.<br />"
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