Yes, it is exactly Belkhayate's COG with 120 periods.
Look, this is the iP aaRG v8a indicator in MT4 and BELCOG(120) in Marketscope. The gray lines are the lines of iP aaRG v8a. The green line in MT4 is just an open price of the corresponding candles:
Shame on the referenced post (
http://forexarena.blogspot.com/2009/11/ ... cator.html) author. He should at least specify the source of his great trading idea. Shouldn't he?
BTW, do you know that BECOG rebuilds
completely every time when a new candle appears? This mades backtesting much harder comparing the indicators which do not change their value depending on further candles.