如何使用Oxyplot创建和绘制ContourSeries？

I have a WPF application where I need to visualize y = y(x1, x2) where x1, x2 are linear coordinates. I can do this using the HeatMapSeries in Oxyplot, but when I want to plot two sets of data in the same window, heatmaps are not the proper tool. A couple of contour series would be better. Now, I have tried to achieve this in the same manner as with the HeatMapSeries, that worked pretty well:I have a WPF application where I need to visual