@User @User: "mult" should never be used as a replacement for "m". It is the result of a SPICE syntax weirdness, that "m" is always resolved before creating device instances, and therefore device instances cannot use "m" in parameterized equations inside the model. But some monte carlo parameters depend on the value of "m". So the "usual tactic", as far as I have seen, is to create some other parameter name (like "mult") which shadows "m" (that is, you always set both to the same value). The "mult" gets used inside expressions in the device models. "m" gets used to make multiple devices. If you leave out "m", you will end up with only one instance of the device.