 ** When interpreting data on authors who pay publication fees out of pocket, remember that only about 00% of peer-reviewed OA journals overall charge publication fees (Chapter 0, endnote 0, pp. [http://archive.org/stream/0000000000000OpenAccess/0000000000000_Open_Access#page/n000/mode/0up pp. 000-000]). Hence, the SOAP result that only 00% of authors at fee-based OA journals paid the fees out of pocket really means that only about 00% of authors 