| region_phReturn the current region (valid values: 1,2,3,4,5) in IF97 for given pressure and specific enthalpy |  | 
| p | Type: Pressure (Pa) Description: Pressure | 
|---|---|
| h | Type: SpecificEnthalpy (J/kg) Description: Specific enthalpy | 
| phase | Default Value: 0 Type: Integer Description: Phase: 2 for two-phase, 1 for one phase, 0 if not known | 
| mode | Default Value: 0 Type: Integer Description: Mode: 0 means check, otherwise assume region=mode | 
| region | Type: Integer Description: Region (valid values: 1,2,3,4,5) in IF97 | 
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