These parameters correspond to the minimum and maximum temperature and pressure limits used for the superheat tables. Pressure and temperature are used to establish the limits because in most instances you will have an idea of the operating range of these quantities in your problem. It is important to make sure that the MIN_PROPERTY_T and MIN_PROPERTY_P parameters (when combined) do not represent a thermodynamic state below the saturated vapor curve for the substance (that is, represent a subcooled liquid). It is also advisable to determine, prior to running the Real Fluid capability, the expected variation in temperature and pressure for the problem and set the table limit parameters accordingly. This will avoid wasting computational time with an unnecessarily large table.