Suppose there are two phases, a water phase and an IL phase, you can use any other name too. We did some calculation between X and each of them. Which of the following is correct:
- Y was calculated between X and both water and IL phases
- Y was calculated between X and both water and IL phase
- Y was calculated between X and each of water and IL phases
- Y was calculated between X and each of water and IL phase
First, I don't know to use "both" or "each of". Secondly, I don't know if I should use "phase" or "phases". I guess "phases" is correct, but then again I think "phase" could be possible too, based on an ellipsis rule, or they may not differ much.