Buy - Bullish crossover of the EMA lines
Sell - Bearish crossover of the EMA lines
Parameters available:
Black Window - the duration where the EMA lines may cross many times without affecting the triggering of the stock
t1 - the number of periods that the EMA lines must not cross before the Black Window
t2 - the number of periods that the EMA lines must not cross after the Black Window
Rule type - please refer to 140 for details
Data type - please refer to 141 for details