Parameters: G0: Leakage conductance in blocking state (default value = 1e-5 Mho) R1: Leakage resistance in first conducting state (default value = 1e-5 Ohm) R2: Leakage resistance in second conducting state (default value = 1e-5 Ohm) R3: Leakage resistance in final conducting state (default value = 1e-5 Ohm) em1: First knee voltage (default value = 1 Volt) em2: Second knee voltage (default value = 2 Volt) em3: Third knee voltage (default value = 3 Volt) e0: Fourth knee voltage (default value = 4 Volt) fm: Bottom intermediate current (default value = 1 Amp) f0: Top intermediate current (default value = 2 Amp)