User set y-axis range

[rolodex]

I am using lineWithFocusChart to show two series. However, it seems that when both series are enabled, I end up with the chart using the max and min values (of both series) to determine the y-axis range. If the two series are flat, this results in a chart with the series drawn at the extreme ends of the chart. tricky to look at.

is it possible to extend python-nvd3 to allow a y-axis range to be user specified? i think in nvd3 its called yDomain