Line Chart With price field for Amibroker (AFL)

_SECTION_BEGIN("1. Line Chart With price Field");
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 ) ) ));

yprice = ParamField("Price Field", 3);

/*0 - returns Open array 
1 - returns High array 
2 - returns Low array 
3 - returns Close array (default) 
4 - returns Average array = (H+L+C)/3 
5 - returns Volume array 
6 - returns Open Interest array 
*/


Plot( yprice, "Close", IIf(C > Ref(C, -1), colorGreen, IIf( C < Ref(C,-1), colorRed, colorDefault)), styleNoTitle | styleLine ); 
_SECTION_END();