Since the new indicators appeared on the site last September the chart of prevalence on the practices page has been pretty awful. It was almost impossible to read the key at the bottom. This was a major limitation of the charting app I was using.
Well now there is something new. Thanks to the rather wonderful Fusion Charts there are now simple and clear charts. The downside is that they do need flash. However the way they work means it will be much easier to add new charts to the site in the future without a huge amount of extra work for the server to do.