This is an image which I received in an email today. I thought some here might find interesting. It was a bit of a fiddle to save it as a picture file. It is probably best viewed on a largish screen. I have posted the image in two halves in the comments below so that the images will be clearer - just click on the image to enlarge it a bit.
More information about this study here: abdn.ac.uk/iahs/research/ep...