ADS power calculation in EM-Model

Hi,
I have some questions about an EM-Model in ADS. I simulated a PCB with 3 differential ports and two ports to ground. After that, I inserted that model to my schematic, placed some components (s-parameter container of real measurements) and want to measure power, current and voltage between the simulated ground ports of the EM-Model and a connected device (input of the device is connected to the port, output with ground.. only a SMD device). Is it possible to insert just the probes (HB simulation) or do I have to pay attention for something?

The second question: after I do a HB Simulation, I found some parameters in my list of variables in the data display:

S2, S3, S5
S2_common, S3_common, S5_common
SN2, SN3, SN5
SP2, SP3, SP5

These three variables are an equivalent to my differential ports from em-model but I have no idea what they represent.

It would be great to get some help!

Regards

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