Errors in using r2_kullback

[strengejacke]

Fixes #667

[codecov[bot]]

Codecov Report

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

Comparison is base (41d60d0) 56.75% compared to head (510eb61) 56.76%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #686 +/- ## ========================================== + Coverage 56.75% 56.76% +0.01% ========================================== Files 84 84 Lines 6037 6039 +2 ========================================== + Hits 3426 3428 +2 Misses 2611 2611 ```

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