he "Variable" property must be set to ''s'' or ''p'' for continuous-time systems, and to one of the following: ''z'', ''q'', ''z^-1'', or ''q^-1'' for discrete-time systems.

The "TimeUnit" property must be set to one of the following: ''nanoseconds'', ''microseconds'', ''milliseconds'', ''seconds'', ''minutes'', ''hours'', ''days'', ''weeks'', ''months'', or ''years''.


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