# Comparison of output between Pylith 2 and Pylith 3

**URL:** <https://community.geodynamics.org/t/comparison-of-output-between-pylith-2-and-pylith-3/2860>\
**Category:** PyLith\
**Created:** [March 14, 2023, 8:54am UTC](https://community.geodynamics.org/t/comparison-of-output-between-pylith-2-and-pylith-3/2860 "2023-03-14T08:54:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Yali](https://avatars.discourse-cdn.com/v4/letter/y/e0b2c6/32.png) [@Yali](https://community.geodynamics.org/u/Yali)\
**Post date:** [March 14, 2023, 8:54am UTC](https://community.geodynamics.org/t/comparison-of-output-between-pylith-2-and-pylith-3/2860/1 "2023-03-14T08:54:08Z")

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Hi developer,  
I am wondering if the outputs with total\_strain and stress in Pylith V2.2.2 are the same as the outputs with Cauchy\_strain and Cauchy\_stress in Pylith V3.0.2, respectively.  
Thank you  
Yali Shao

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**Author:** ![baagaard](https://yyz2.discourse-cdn.com/flex036/user_avatar/community.geodynamics.org/baagaard/32/615_2.png) [@baagaard](https://community.geodynamics.org/u/baagaard)\
**Post date:** [March 14, 2023, 2:34pm UTC](https://community.geodynamics.org/t/comparison-of-output-between-pylith-2-and-pylith-3/2860/2 "2023-03-14T14:34:45Z")

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You are correct. For linear elasticity with infinitesimal strain, in PyLith v1 and v2, we called the strain and stress fields `total_strain` and `stress` in the output, whereas in v3 they are called `cauchy_strain` and `cauchy_stress`. The names in v3 are more explicit in terms of the strain and stress measures being used.