It is a requirement to choose one of the arguments within square brackets. For example, lets say that the first 5 volumes are taken, for the first iteration, volumes 1,2,3,4,5 are going to be taken ...
If you are looking for wrappers to link Refprop with Excel, Matlab, Python, C++, C#, VB, or Labview and have come across this page but cannot find the code, below is the link where these items can be ...