fix: fix new width in broad singlet peak

[codecov[bot]]

Codecov Report

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

Project coverage is 94.33%. Comparing base (883b2fc) to head (b95aafe).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #117 +/- ## ========================================== + Coverage 94.13% 94.33% +0.19% ========================================== Files 10 10 Lines 307 300 -7 Branches 114 114 ========================================== - Hits 289 283 -6 + Misses 18 17 -1 ```

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