The graph tab uses equations for many of its curve measurements. For example, the measurement “resistance1” is defined as:
real( 1 / yNN )
All of these equations are available to you to use in your own user equation. You may insert the definition of any of these equations by clicking on the Eqns tab in the graph tab’s Equation Editor, selecting the equation, and clicking on the Insert into Expression button. See curve measurements for an explanation of each item.