To create them in NinjaTrader:
- Export optimization results of a moving average crossover system into Excel
- Create a Pivot Table of results
- Apply conditional formatting

I didn't use the 11/21 because I am trying to avoid cherry picking (selecting the best results) and be closer to the middle of the island of green.  The markets shift through time and the underlying theory behind the charts is that in the long run, the best area of results will tend to continue to outperform and we should try and put ourselves within that area.