#<frequency_units> s <complex_data_format> r <reference_impedance_value>
freq s11 s21 s31 ... s12 s22 s32 ... s13 s23 s33...
2.500 0.7070 128.1 1.246 30.1 0.1175 37.7 0.4261 -75.5
3.000 0.7449 110.9 0.985 15.5 0.1475 41.9 0.4218 -93.3