Here is my finalized 4k Tethys texture for download. It will also be part of the Celestia-1.4.1 source tar-ball.
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http://www.celestiaproject.net/~t00fri/images/tethys4k.jpg
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I am quite pleased with the texture now after quite a few further touch-ups...Notably, the color transitions across texture patches of different resolution and from different sources have been substantially homogenized.
The texture was color-mapped by computer, using the natural color template,
http://photojournal.jpl.nasa.gov/catalog/PIA06140
Enjoy,
Fridger
