I have PV and high two series on one chart. I need to compare PV vlaue with high, when PV value is deviated to high then set the color red. I wrote the expression as "IFF(PV<=HIGH, RED, GREEN", for which I got the color but there is a small problem. For example: PV = 20, 25, 28, 35, 37, 39, 28. High = 30. X-AXIS define the time. Based on PV values, we draw the plot before deviation value point (28) and after deviation value point (35), the connection line is shown in red. This is my problem. I need to get (28 to 35 in between line up to 28 to 30 as green. After 30 to 35 as red.