Green in Sherpa, author can archive post-print (ie final draft post-refereeing). e-mail sent to author 13.05.11-MMM, recd 09.06.11-MMM. Added: ResPubID23288 & category c1 Refereed Journal Article, author - Stephen Gray signed VUIR permission pt.13/6/12 from dup., 27.8.12-MMM. Supporting documentation added to dark upload - HD 13/11/17. HERDC documentation added to dark upload - HD 27/7/20