Accurate Overbought Oversold Zone - Amibroker AFL Code

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"CHAIKIN MF";

P=Param("Periods",5,2,100,1);
A=(((C-L)-(H-C))/(H-L))*V;
B1=Sum(A,P)/Sum(V,P);
B2=EMA(B1- Ref(B1,-1),14);
B3=EMA(B2,17);
B=EMA(B3,7);
Plot(B,"Chaikin MF",colorBlue, styleLine|styleNoLabel);
PlotOHLC(B,B,0,B,"",IIf(B>0,colorLime,colorPink),styleCloud);
Plot(0,"",colorBlack, styleLine|styleThick);