Currently, I can use a step line to draw non-continuous data. However, the rendering of the first or last data points in a series does not show the leading or following horizontal data line.

For example, the last data point in the first series represents the data from Apr to May. However, the rendering makes it seem like it's only data for Apr and that there's a gap in data between Apr and May.

http://jsfiddle.net/4D7US/