$Backgroundparameter
Format
$Backgroundparameter εr μr σE σH // all of them are floating points.
The function can set the background parameters. Where εr is relative permittivity, μr is relative permeability, σE is electric conductivity, and σH is equivalent magnetic loss, respectively.
The default values are 1.0, 1.0, 0, and 0.
Example
$Backgroundparameter 1.0 1.0 0.0 0.0