Atan OHLC Indicator
Place this indicator in it's own window above the price chart 

A2:=Sum((O+H+L+C)/4,30); 
A:=Mov(Mov(Atan(Ref(A2,-15),A2),2,S),2,S); 
B:=Mov(Mov(Atan(A2,Ref(A2,-15)),2,S),2,S); 
A;B;