Difference between interface_delta_X and dG_separated?

Hi, everyone!

I am using RosettaLigand design protocol to design some mutants, in order to improve binding affinity to a small molecule. When I was using InterfaceAnalyzer, there were 2 values representing binding affinity, interface_delta_X and dG_separated. I want to know the difference between these 2 values and which one I can use during the filter process.

Any suggestion will be appreciated!

Nicole