Use the macron spelling of the word

Error²Federal courts, Illinois courts21st and 22nd editions

Table T2's Japan page romanizes its court, reporter, periodical and code names with a macron over each long vowel; a citation dropping that mark from one of those names misspells it.¹

1. 1T2.24 Japan.
2. 2An error: the rule in note 1 allows one form, and this is not it.