Up Arrow
Spike is at least 75% of the total range of the candle and,
in a downtrend the spike shoots down and the "low" is lower than the last 4 lows;
the opposite shadow is no more than a 3% of the total range of the candle
If MA filter is on, we will have arrow only if price is below moving average.
Vice versa for Down Arrow
The indicator was revised and updated