UIC: Skip the D.C. operating solution and use user-specified initial conditions.
steady: Stop the simulation when steady state has been reached.
nodiscard: Don't delete the part of the transient simulation before steady state is reached.
startup: Solve the initial operating point with independent voltage and current sources turned off. Then start the transient analysis and turn these sources on in the first 20 us of the simulation.
step: Compute the step response of the circuit.