From what I've read from other sites (such like this PDF), Tangerine Stream indeed just had 7KEYS/14KEYS charts back then (except on 5th style CS, where it had NORMAL charts). Both BEAT SQUARE and BEMANIWiki 2nd mention that Tangerine Stream's NORMAL charts were added in HAPPY SKY. I think the 0 shown in SmartData might be that the charts were added back then in 9th style, but weren't selectable for some reason (like Line Times' EX chart in arcades). --FinalOffset (talk) 15:59, 27 July 2014 (UTC)