I have the data income plotted in graph 
I would like to fill in a color under the data line, I am using qplot for that.
Is there any possibility I can do that?
The code below shows shows how it was plotted, I do not mind using ggplot2 as well as long as I can fill under it 
qplot(dat$amount_WW,dat$location, group = 1, geom=c("line","point"), ylab="amount",xlab="location",main="Ages 18-25")
Thank alot for your help
 
    