I downloaded the rgraphs zip, put it in my apache htdocs folder. This zip has a demo folder, so I went through several of the demos but the graphs are a little blurry. On rgraphs website they have the exact same graphs hosted in a demo section, on their page the graphs are crisp and perfect. In localhost the graph appears a little bigger than on rgraphs website.
I'm using Apache 2.2.24 and starting the server with httpd -k start.
I hope there is something glaringly obvious which I'm missing