i was screwed by this spike down on NG for July:
http://futuresource.quote.com/quotes/chart.action?symbol=NG+N1&compareTo=&topsyms=NG&month=N&year=2011&chartAggregation=V&chartMinutes=1&chartStyle=BAR&chartSize=745x550&chartDensity=LOW&userStudies=&x=54&y=16