I have data which consists of two concentrations, and a network of connected points, which I'm trying to visualize. My first solution might be to generate tables from the contour plots of the two concentrations, and then plot them using plot (one red, say, and the other blue). I could then plot the network as black lines. I'm thinking this might look a bit of a mess though.
Ideal solution might be a pm3d splot with color going from white (no concentration) to either red (one concentration value) or blue (the second concentration value), with 50/50 concentrations being purple.
Firstly, I have no idea how to generate this pm3d plot!
Secondly, can I plot lines on top of the pm3d plot?