Hi, is there a way to draw the outlines of the bars when plotting an histogram e.g. http://www.mathsisfun.com/data/images/histogram.gif as opposed to http://d1qchgnwtps1zh.cloudfront.net/winston/520f8076fed8057daf05b8b2e991bca9c7d10efe.png I am asking both for Winston and Gadfly.
Cheers.
