Hello, e.g. I want to do a calculation with the open of the bar at 13:00. I am beginner... This don't work: variables: openStart(0), closeEnd(0) ; if Time = 1300 then openStart = Open ; if Time = 1700 then closeEnd = Close ; plot3(closeEnd - openStart ) ; plot3 shows me for every bar a across or point in my subchart and I can not refer/understand what the values are. So how can I calculate only the specific bars?