Calculation of the Critical Point and Saturation States in the Critical Region.Changing Fluids and Calling SETUP Multiple Times.Intro to Pure Fluids and 2-Phase States.Reference States (enthalpy and entropy differences).Referencing the REFPROP Program in Publications.REFPROP is a Program, not a Database Containing Measurements.For questions not answered here, please see the user’s guide. Sections with new information added during the last several months are identified with a «. To download any of the files listed below, right-click on the file and select Save Target As… and then add the file to your Refprop or other appropriate directory. The following information gives answers to some of the most frequently asked questions concerning the REFPROP program. See see below for information about REFPROP version 10.0 Answers to Frequently Asked Questions Version 10.0 of REFPROP has been released. NIST Website About NIST usnistgov on GitHub Version 10.0!