Using R in Spotfire 6.5 to add a custom line to a bar chart.

[@rohitbhatia24]

Hi, I was trying to do something similar to this.
Instead of a one single horizontal line, I am looking for a bullet graph kind of a representation.
Say, each bar represents metric for a single person in a group and the small horizontal line for each bar showing the average, and there are multiple bars each represented by a city or so.
Do you think this is possible?