Well, you can look at that POV-Ray code there and see, but I don't think there's anything oddly different about O or C. A different choice of POV-Ray parameters such as Paul suggests might be an idea. But other than that, it's just what POV-Ray does with it.
Paul and Robert,
Thank you very much for your responses.
They are very helpful.
I do have a couple of more questions – I hope that you do not mind.
Am I wrong about the reflection looking different for the oxygen versus the carbon?
If I export a jpeg they look fine, only when I try to export a povray do they look different.
Is there an easy way to fix this? I do not want to manually change the povray files – I guess
that I could write a script to edit them.
Thank you again.