When FFT data is shown the most interesting data occurs as vertical lines or peaks. When interrogating the data with plot cursor there is not a cursor type that will show the data underneath the cursor. See the plots below
The line style of the cursor can be changed to some type of "dashed" to show some of the data, however there is not a current style of cursor that has the benefit of showing a line that is drag-able without covering the data.
One possible solution is add a select-able cursor type that will show the line above the Y value but not below. So when the cursor is moved to a peak the Y value of the cursor is at the peak, there is a small circle or box and a line from the Y value going positive but no line below the Y value going negative.
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