[R] Lattice: barchart, error bars and grouped data

[Dieter Menne]

Johannes wrote:
> 
> 
> How can I, given the code snippet below, draw the error bars in the center 
> of each grouped bar rather than in the center of the group?
> 

http://markmail.org/message/oljgimkav2qcdyre

Dieter

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