:::I interpreted the first column as meaning "do the EU treaties apply de jure in this territory" and the other columns as specifying the most common opt-outs (and opt-ins) that are possible within the treaties. For example, Iceland and Norway apply a lot of EU law, which is enforceable in local courts, through the EEA Treaty, but they are not part of the EU. Switzerland applies a lot of EU law through the bilateral agreements, and even more of its own initiative: the same goes for the candidate states.