[R] shading bar charts

[Federico Tomassini]

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Hi alls,

i have to code a family of bar charts. After reading the doc, i cannot
understand if it is possible to shade the bar colors and how.

With shading i don't mean `density`. I mean something like that:

http://www.advsofteng.com/images/colorcylinder_g.png


Thanks and br

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Federico
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