Yes, you can. Graphs, numbers, it doesn't matter, it's all information.
Can I copyright my book? What if someone converts my entire book from letters to numbers and them modulates the numbers as a mathematical graph using, say amplitude. Can he freely distribute that graph? Or better yet, can he convert that graph from pixels on a screen to radio waves and broadcast it?
https://en.wikipedia.org/wiki/Fictitious_entry
Mathematical facts are usually also not copyrightable for the same reason: they're just considered raw data. However, we can obviously copyright a mathematics book or article because there's more than just raw facts in it: there's style, presentation, and many other signs of authorship.
> In a legal sense also, you can copyright the content of a math book (such as diagrams, word problems, and illustrations) but the formula, problems, proofs, theorems themselves cannot be copyrighted. You cannot copyright a fact which is established and natural i.e., 1+1=2.