This graph contains a wealth of information. The relative sizes of each flow are not easily visible from the arrow sizes, as would be the case in a sankey diagram, but each box is labeled with the relevant figure, which makes it possible to understand the size of each flow by reading through the image. It takes a bit more time, but at the same time this diagram makes it possible to convey a lot of information without being too cluttered or unclear. The way that additions to stock and additions to feedstocks are shown in a box is clever and very clear as well.