You must first check the checkbox in the Simulation Command dialog,
after which the signals will appear in the User Defined Signals
autocomplete lists.
Adds maximum step size setting used by transient analysis solver,
and 'use initial conditions (uic)' setting. Enabling uic disables
DC operating point analysis and may introduce singularities. It requires
a careful selection of initial conditions of circuit elements.
Fixes https://gitlab.com/kicad/code/kicad/issues/2515
Also fixes a bug so that voltages, currents and power dissipations are
only probed if the flag is set -- this keeps ngspice from throwing an
error if you probe something twice (for instance, if you have .probe
commands in text and turn off the auto-probing).
Jeff Young
Okan Demir
Wayne Stambaugh