Plot Expr on Graph
Syntax	Plot1{float <expr>,color color} Plot2{float <expr>,color color} Plot3{float expr>,color color}
Description	It Will plot graph on the displayed chart. The way it works is it draw a line between last calculate value and current calulated value for plot with specified color
Example	plot1{high[0],red} This will plot a line connecting high value of the bar and will draw a line in red color.