Is there a simple way to define and display discrete points on a curve, e.g.: Phase at 20, 100, 10k and 20kHz?

This method requires 2 steps:

1. Setup a Limit Step to detect Failed Points 

In the Data tab of the Limits Editor select the Data Curve. In this case, Fundamental and select the proper Axis: Z for Phase.

Enter the same frequency values in the Upper and Lower Limit fields and set the Z value to a range where the step will ALWAYS FAIL. This allows you to always get the values from the step. For this example, -180 for the Upper Limit and +180 for the Lower Limit.

In the Parameters tab of the Limit Editor select Individual Points under Limits Parameters > Alignment. Select Upper & Lower then check Output Failed Points.

Click OK to close the Limit Editor. Note that there will be a warning stating that the Upper Limits are lower than the Lower Limit, which is necessary to always get values from the step.

2. Rename one of the Failed Point Curves to "Discreet Points" using a Post Processing step set to Constant.

Select one of the Failed Points curves in Operand A and select "User Defined" in Operand B.

Set Constant to 0 and the Operation to + in Linear mode.

Enter a meaning full name for the Desired Result, in this case "Phase Points", and select the appropriate data axis. 

You can then display the Phase Points curve in a table as shown in the following screen shot.





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