Help me make sense of S-parameters - 3 antenna ports

Hi, I'm actually trying to do something very similar. I simultaneously exciting 3 discrete dipole antenna ports. However I cant seem to make any sense out of the S-parameters I get. Instead of the generic S-parameters (S11, S12, S21, ..... ) I get these : S1,Simulation_1; S2,Simulation_1; S3,Simulation_1. any help here would be much appreciated! thanks in advance!