skrf.frequency
skrf.network
skrf.networkSet
skrf.plotting
skrf.mathFunctions
skrf.tlineFunctions
skrf.constants
skrf.util
skrf.io
skrf.calibration.calibration
skrf.media
skrf.vi
NISTMultilineTRL.
er_eff
Effective permittivity of the solved line.
Currently, this only works for TEM media. If you are using non-TEM media (ie rectangular waveguide) then you need to compute er yourself from gamma.