What makes it hard for you to understand that colour code? Is that the colours are not distinct enough, or the labels don't quite match up, or something else? I had some trouble matching the colours from my GIMP map to the key, which I made in Illustrator. Even when I used the same RGB values, it didn't look quite the same, due to opacity settings. I've revised the map a little, but before uploading, I'd like to make sure the colour codes make sense and people can actually provide any sensible feedback.