The Environmental Protection Agency on Tuesday submitted a proposed repeal of the Clean Power Plan, Obama’s signature rule to limit greenhouse gas emissions from power plants.

The proposed rule was submitted to the Federal Register, which tracks proposed rule changes from federal agencies. It is a revealing document, largely devoted to legal arguments over just how much the EPA can regulate — only smokestacks, or entire energy systems — to cut pollution.

The first 10 pages or so are a preamble largely laying out the background of the rule, and taking up EPA chief Scott Pruitt’s central beef with the plan: It forces states to make pollution cuts above and beyond improvements at individual power plants.

Here’s your guide to reading the most interesting parts of the text.