New Post: AreaChart, define smartly Y axys

Define both a LineSeries and an AreaSeries with transparent color for the lines of the AreaSeries. This way you won't have that zero line. Other solution could be setting the DataFieldY2 to a negative number and then limiting the AbsolutMinimum of the Y-axis. To get more similar look set transparency of AreaSeries, set a grid with solid lines, move the Y axis to the right and disable minor ticks. You should also touch the borders, they seems to be LightGray.ChangeAlpha(60) or so.

For the other graph is a bit more complicated but I think you can do it with CategoryAxis using bars.

Good luck