The Coates Moving Averages provide a band around the price using the 2 low and 2 high mas along with the 9 least square mean. Crossovers are used to identify reversals. When the 9 lsm crosses below the 2 low ma then it signals a bullish reversal. This can indicate full profit taking on shorts and / or a long entry.
The exa can be used to confirm entry / exit signals. When the 9 lsm crosses below the 2 low ma a long entry is confirmed when the exa is around -2 and vice versa.