I've downloaded a couple of transparency and color maps for Saturn's rings 
from various locations on the internet (such as: 
http://www.mmedia.is/~bjj/data/s_rings/index.html), but I'm having trouble 
figuring out exactly how to use these color/transparency 'strips' in an 
actual texture.  Best I can do is get the texture applied in some screwy 
radial fashion instead of onion-like concentric rings.

Would anyone be so kind as to show me a simple example of how to effectively 
use these images to map onto a disc (or similar)?

- How

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