# Two replicas have identical temperatures

**URL:** <https://gromacs.bioexcel.eu/t/two-replicas-have-identical-temperatures/3077>\
**Category:** User discussions\
**Created:** [November 4, 2021, 4:48pm UTC](https://gromacs.bioexcel.eu/t/two-replicas-have-identical-temperatures/3077 "2021-11-04T16:48:06Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![sadr](https://avatars.discourse-cdn.com/v4/letter/s/ba9def/32.png) [@sadr](https://gromacs.bioexcel.eu/u/sadr)\
**Post date:** [November 4, 2021, 4:48pm UTC](https://gromacs.bioexcel.eu/t/two-replicas-have-identical-temperatures/3077/1 "2021-11-04T16:48:06Z")

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i’m facing a problem with replica exchange

> Fatal error:  
> Two replicas have identical temperatures

which files i should check for identical temperatures ?

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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 6, 2021, 4:51pm UTC](https://gromacs.bioexcel.eu/t/two-replicas-have-identical-temperatures/3077/2 "2021-11-06T16:51:11Z")

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The header of each `.log` file will list all of the input options, so you should be able to spot the duplicate temperatures there.

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**Author:** ![sadr](https://avatars.discourse-cdn.com/v4/letter/s/ba9def/32.png) [@sadr](https://gromacs.bioexcel.eu/u/sadr)\
**Post date:** [November 7, 2021, 12:58pm UTC](https://gromacs.bioexcel.eu/t/two-replicas-have-identical-temperatures/3077/3 "2021-11-07T12:58:57Z")

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thanks a lot for replying i figured that i wrote the same directory twice