$ifelectrode
$ifelectrode is the command to setup the bias operation range. In the program, there are 4 types of electrical contacts, which are gate, drain, source, and base contact. The command is as following
$ifelectrode vgstart, vgend, vgstep vdstart, vdend, vdstep vsstart, vsend, vsstep vbstart, vbend, vbstep