bar plot with non-zero starting level

Hi,

I want to plot grouped bars to compare 95% confidence interval estimates 
from two models. Each bar represents a 95% confidence interval estimate 
of a coefficient from one of the two models. Each group represents 
confidence interval estimates of the same coefficient from the two models.

I think such a bar plot will nicely present whether 95% confidence 
interval estimates of the same coefficient from the two models overlap. 
All these confidence intervals do not start from the x axis.

I searched bar plot examples on Google. I found methods to plot bars in 
groups by barplot(). I could only specify one offset for all confidence 
interval estimates of the same model. I could not individually specify 
an offset for each confidence interval estimate. Can someone please help 
me on how I may proceed with individual offset for each of the bar in 
the plot?

Thank you in advance.

Kind regards,

Xianwen