title: any option to reduce the mouse hover area
body: <p>i am working on d3. and the problem which i am facing is that whenever i take the mouse pointer inside the graph it immediately shows the hover details. but the thing is that i am in need of showing the hover details only if the mouse pointer is exactly over the datapoint  or a graph point. the graph which i am working is <a href="http://code.shutterstock.com/rickshaw/examples/lines.html" rel="nofollow">http://code.shutterstock.com/rickshaw/examples/lines.html</a>. any help would be appreciated to reduce the size of the mouse hover area.</p>