Steve,
If you want to compare the colour image with Johan's Warrel map made with the old SVST, this map is available at
http://www.astro.uu.se/planet/planet...map_global.jpg
My image has a CM of roughly 180, the map is orientated North so you have to rotate my image 180 degrees to make a comparison. As far as I can see the features are matching pretty well, so I think the dark zone near the terminator just south of the equator is real.
Cheers,