Simple export/point graph question

Hi guys,

I'm working on a simulation of an electrochemical cell (simple 1D geometry with one end grounded and the other set to a bias voltage), and I'd like to export the data pertaining to the potential drop between one of the electrodes and the center of the cell. At first I tried creating a point in the center of the domain and then making a point graph of the potential at that point for each of the voltage parameters of the sweep, but when I tried to create the graph, I couldn't see or select the point anymore. My friend in the same lab told me that you can choose to export the solution data from a specific geometric point, but that he couldn't remember how to do this. If this is possible or if any of you have any suggestions, I'd appreciate.

Thanks!