@doctorow
Are you sure ? I found higher definition of them here : space4case.com/mmw/pages/space

They have copyrjght mention with another name.

On space4case, it is said :

"Made mainly with the digital elevation models of the Mars Orbiter Laser Altimeter (MOLA).

These are visualizations of Mars in ancient, today's and future settings. Made with 3DEM data converter and Terragen versions 8.11, 8.44, 9.19, 9.34 and the new Terragen 2 software."

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