Bear with me on this chart/Discussion. Below find the 1 year nat Gas curve from today( Green line) and 1 week ago(Orange line).Below the line graphs is a Histogram which shows the change in prices of each contract over the one week period.You can tell quite easily that the front part of the curve has taken the brunt of selling compared to deferred months.The reason ,I believe is that the verdict is unknown when comes to forecasting Winter weather so some hesitation towards aggressive selling in those months.Summer is quite possibly over so more confidence to liquidate September and October contracts and spreads which have these as front months.Contract lows have been scored for many gas spreads today.