More precise modeling of direct interactions by not using unified list 1
When we use a unified list 1 in the performance model for the FMM, we are putting together the direct contributions from the following three sources:
- List 1
- List 3 close
- List 4 close
It might be useful to include the option to see the impact of each of these separately. In particular, this might help with assessing the impact of stickout tracking which doesn't impact List 1.