Floating Column(Max/Min) Graph in ROR

Question

I need to create a graph as shown in the image below. I have the values for the upper limit, lower limit and the average for each question. Can anyone suggest a plugin in Ruby on Rails to create such a graph shown in the image?

Edit:

I am finding it difficult to find something which does clear the area from the X-axis(Question axis) to the lower limit. Can anyone help me with this?

Answer 1

Google has a URL based chart API that and it looks like some of the chart types available will match what you are looking for:

Chart Gallery: http://code.google.com/apis/chart/docs/gallery/chart_gall.html

Getting Started Guide: http://code.google.com/apis/chart/docs/making_charts.html