skrf.network
skrf.frequency
skrf.networkSet
skrf.plotting
skrf.taper
skrf.calibration.calibration
skrf.vi
skrf.vectorFitting
skrf.time
skrf.circuit
skrf.media.device
skrf.mathFunctions
skrf.tlineFunctions
skrf.instances
skrf.constants
skrf.data
skrf.util
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.