Parametric sweep in FEKO

How do i perform a parametric sweep in feko? i want to plot the impedance vs. distance between two antennas.

advice??

Added after 5 hours 8 minutes:

Is no one smart enough to answer this question?

Define the distance between the antennas with a variable and then setup a grid search with impedance goal in the optimisation section.

Is there a way to perform a sweep, not an optimization? Sometimes a sweep is nice to determine relationships amongs variables.