Bollinger Band-AFL

_SECTION_BEGIN("Price");
SetChartOptions(0,chartShowArrows|chartShowDates);
_N(Title = StrFormat("{{NAME}} - {{INTERVAL}} {{DATE}} Open %g, Hi %g, Lo %g, Close %g (%.1f%%) {{VALUES}}", O, H, L, C, SelectedValue( ROC( C, 1 ) ) ));
Plot( C, "Close", ParamColor("Color", colorDefault ), styleNoTitle | ParamStyle("Style") | GetPriceStyle() ); 
_SECTION_END();

_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", colorLightGrey );
Style = ParamStyle("Style", styleLine | styleNoLabel ) | styleNoLabel;
Plot( bbt = BBandTop( P, Periods, Width ), "BBTop" + _PARAM_VALUES(), Color, Style ); 
Plot( bbb = BBandBot( P, Periods, Width ), "BBBot" + _PARAM_VALUES(), Color, Style ); 
PlotOHLC( bbt, bbt, bbb, bbb, "", ColorBlend( Color, GetChartBkColor(), 0.8 ), styleNoLabel | styleCloud | styleNoRescale, Null, Null, Null, -1 );
_SECTION_END();