What is the correct prop size for a particular engine displacement?

I asked this question some time back, and received a link to a Top Flite site so that I could print out a graph.

It didn't print very well and is almost unreadable, so would appreciate it if someone can direct me to a ready reckoner for prop size versus engine displacement please. A link to the same graph would be be OK; different printer may help, but a new graph, or even the same one would be OK.