Hi, I'm adding a refrigerant using user defined real gas, the equation of state is based on Redlich-Kwong equation type (which has dropdown menu of "Original", "Wilson", "Barnes-King" and "Soave") but the ones that I will add is based on Refrigerant Properties(REFPROP)  with different equation of state not originated from Redlich-Kwong, how will I add these equation of state by not using Redlich-Kwong? How can I change equation of state for properties of specific heat, viscosity,...? Please help.