Hi everyone

I'm trying to make a figure of a superposition of various loops, each with
a different colour.  I need a slim trace of the loops so that each may be
seen clearly.

In normal view I can control the loop width using either
cartoon_loop_radius or ribbon_width, depending on whether I display
cartoon or width.  Ray-tracing looks prettier but I find that even traces
that are very slim in normal view get converted to a fairly fat tube on
ray-tracing.  Is there any way to control this?

Thanks very much in advance

Daniel

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|                       Dr Daniel John Rigden                             |
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