How to make dodge in geom_bar agree with dodge in geom_errorbar, geom_point

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The alignment problems are due, in part, to your bars not representing the data you intend. The following lines up correctly:

ggplot(my_data, aes(x=day, weight=mid, ymin=mid-sigma, ymax=mid+sigma, fill=group)) +
     geom_bar      (position=position_dodge(), aes(y=mid), stat="identity") +
     geom_errorbar (position=position_dodge(width=0.9), colour="black") +
     geom_point    (position=position_dodge(width=0.9), aes(y=mid, colour=group))

enter image description here

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