'A' a long signal
The commercials are at a maximum long position (longest in three years) and their acceleration of trading activity over the previous six weeks is very high (over 50% in the green line at the botton). Entering long on December 12, 2012, soon after the previous bearish trend was broken and holding that position until this bullish trend ended on February 15, 2013, would have yielded a gain of $8,170 per contract.
'B' a short signal
The commericals are at a maximum short position - lowest in three years and the commercials' activity in the last six weeks has accelerated to a high level (about 40% in the green line at the bottom). Shortly after the bullish trend ended, there was a short entry on July 25, 2014. Holding that position until the bearish trend ended on February 2, 2015 would have yielded a gain of $49,350 per contract.