title: Overflow with LineWithFocusChart when interpolating nvd3
body: <p>I have a problem with the LineWithFocusChart. Whenever I use interpolate('cardinal') the graph-line is cut at the border of the graph. How can I add some kind of padding or enable the graph to draw outside its borders?
  <a href="https://i.stack.imgur.com/EsojE.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/EsojE.png" alt="image of the chart"></a></p>