Thanks for contributing code! Please include a description of your change and
check your PR against the list below (for further questions, refer to the
[contributing guide](https://github.com/Cantera/cantera/blob/master/CONTRIBUTING.md)).

- [ ] There is a clear use-case for this code change
- [ ] The commit message has a short title & references relevant issues
- [ ] Build passes (`scons build` & `scons test`) and unit tests address code coverage

**Please fill in the issue number this pull request is fixing**

Fixes #

**Changes proposed in this pull request**

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