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[amibroker] bollinger band vs price - scanning



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I have no experience with AFL.

Can someone help me to generate an afl for scanning ..... if price =< 
or lower than "low bollinger band" = list in scan result

the original BB as follow :

_SECTION_BEGIN("Bollinger Bands");
P = ParamField("Price field",-1);
Periods = Param("Periods", 15, 2, 100, 1 );
Width = Param("Width", 2, 0, 10, 0.05 );
Color = ParamColor("Color", colorCycle );
Style = ParamStyle("Style");
Plot( BBandTop( P, Periods, Width ), "BBTop" + _PARAM_VALUES(), 
Color, Style ); 
Plot( BBandBot( P, Periods, Width ), "BBBot" + _PARAM_VALUES(), 
Color, Style ); 
_SECTION_END();


Thank you in advanced 



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