Does anyone know how to create a simple legend based on this algorithm used to create the following image? The color gradient goes from purple to red in the z direction, and colors points (faces) according to their location in the z direction from the lowest z value (purple) to the highest z value (red). I just want simple legend that shows a scale from purple to red in mm (also showing the values where other colors appear). I tried using the legend that comes with grasshopper, but it has a 4 color maximum, and I tried using ladybug but have had no luck using their legend. I am not sure the ladybug legend is compatible with regular grasshopper components of this algorithm. New user to grasshopper but very impressed with the software so far!  Any help is greatly appreciated!

Thanks, 

Ron