The Mov Avg 2 lines indicator calculates and plots two simple exponential moving averages of the prices specified by in the fast and slow price inputs from the number of most recent bars specified by in the fast and slow length inputs.
The indicator with default settings plots an exponential moving average of the closing prices of the last 9 bars and an exponential moving average of the closing prices of the last 18 bars. The average of shorter length (fast average) will be more sensitive to current price changes than the average of greater length (slow average).