# Removing of global motion after MD

**URL:** <https://gromacs.bioexcel.eu/t/removing-of-global-motion-after-md/128>\
**Category:** User discussions\
**Created:** [May 13, 2020, 1:33pm UTC](https://gromacs.bioexcel.eu/t/removing-of-global-motion-after-md/128 "2020-05-13T13:33:08Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ericpellegrini](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/ericpellegrini/32/43_2.png) [@ericpellegrini](https://gromacs.bioexcel.eu/u/ericpellegrini)\
**Post date:** [May 13, 2020, 1:33pm UTC](https://gromacs.bioexcel.eu/t/removing-of-global-motion-after-md/128/1 "2020-05-13T13:33:08Z")

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GROMACS version: any  
GROMACS modification: Yes/No

Hi all,

I would like to know if gromacs proposes some solutions for removing the global rotation and translation **after** the MD has been performed. Indeed, I can see my protein drifting during the course of my MD and I would like to get rid of this extra motion. I checked at _trjconv_ but could not see any option that could do the job.

Thanks in advance

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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:** [May 13, 2020, 1:45pm UTC](https://gromacs.bioexcel.eu/t/removing-of-global-motion-after-md/128/2 "2020-05-13T13:45:44Z")

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`gmx trjconv -fit rot+trans` does this.

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<div class="post-metadata">

**Author:** ![ericpellegrini](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/ericpellegrini/32/43_2.png) [@ericpellegrini](https://gromacs.bioexcel.eu/u/ericpellegrini)\
**Post date:** [May 13, 2020, 1:54pm UTC](https://gromacs.bioexcel.eu/t/removing-of-global-motion-after-md/128/3 "2020-05-13T13:54:58Z")

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Oups sorry for having missed that … Thanks a lot for your help.