Here's an NU 15 minute chart with 1000 and 2 for the large and 500 and 2 for the smaller COG. I'm actually already in this short trade as of Friday for other reasons. Let's see if the COG reacts like I expect it to.
In the case of NU, price seems to respect the green levels in the larger COG rather than the brown. I'm guessing the green levels are equivalent to dynamic 61.8 and 38.2 levels.