add a detrainment parameter

[szy21]

Purpose

To-do

Content

---

• [ ] I have read and checked the items on the review checklist.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.50%. Comparing base (e6a73ed) to head (6e23e33). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #187 +/- ## ======================================= Coverage 98.50% 98.50% ======================================= Files 2 2 Lines 134 134 ======================================= Hits 132 132 Misses 2 2 ```

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