defines using the Min-Max Method configured as a Dependent Peak on the tangent skimmed peak. Using a second derivative method, correct placement of the SB/EB and SI/EI will generate a tangent line as drawn from the valley toward the EI window. The second derivative is applied to the two fused peaks to define the beginning and end of the tangential skimmed. This eliminates the possibility of subtracting off area that is not measured.