By default, the supply contact for a set of rules is also used to connect to the substrate (body) contacts for a given type of transistor. There may be cases where one wants to use a different substrate connection than the corresponding supply, for instance with power-gating. The substrate contacts of transistors for netlist back-ends can be overridden with an additional set of prs parameters:
All arguments are optional; the prs parameters always form a 4-tuple, which includes the default connections when left unspecified.