# Pbc correction

**URL:** <https://gromacs.bioexcel.eu/t/pbc-correction/3138>\
**Category:** User discussions\
**Tags:** pbc\
**Created:** [November 12, 2021, 5:36pm UTC](https://gromacs.bioexcel.eu/t/pbc-correction/3138 "2021-11-12T17:36:26Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![alexmathew](https://avatars.discourse-cdn.com/v4/letter/a/f4b2a3/32.png) [@alexmathew](https://gromacs.bioexcel.eu/u/alexmathew)\
**Post date:** [November 12, 2021, 5:36pm UTC](https://gromacs.bioexcel.eu/t/pbc-correction/3138/1 "2021-11-12T17:36:26Z")

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GROMACS version:  
GROMACS modification: Yes/No

Someone can tell me how to fix pbc issue from the below figures

 ![pbc](https://europe1.discourse-cdn.com/flex017/uploads/bioexcel1/original/2X/2/22d2d6a9fba42bc185fb35778964a64e59091530.jpeg)

I have tried

pbc mol -center -ur compact

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**Author:** ![jalemkul](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/jalemkul/32/18_2.png) [@jalemkul](https://gromacs.bioexcel.eu/u/jalemkul)\
**Post date:** [November 12, 2021, 7:16pm UTC](https://gromacs.bioexcel.eu/t/pbc-correction/3138/2 "2021-11-12T19:16:24Z")

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What are we looking at? When you tried centering, what did you choose as the group to recenter on?