# Gmx bar output: interpretation of +/- error estimations

**URL:** <https://gromacs.bioexcel.eu/t/gmx-bar-output-interpretation-of-error-estimations/10051>\
**Category:** User discussions\
**Tags:** free-energy\
**Created:** [August 30, 2024, 1:44pm UTC](https://gromacs.bioexcel.eu/t/gmx-bar-output-interpretation-of-error-estimations/10051 "2024-08-30T13:44:28Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Jacopo](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/jacopo/32/3635_2.png) [@Jacopo](https://gromacs.bioexcel.eu/u/Jacopo)\
**Post date:** [August 30, 2024, 1:44pm UTC](https://gromacs.bioexcel.eu/t/gmx-bar-output-interpretation-of-error-estimations/10051/1 "2024-08-30T13:44:28Z")

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GROMACS version: any version  
GROMACS modification: No

Hi everyone,

I am getting confused regarding the screen output of gmx bar. I have two question.

What type of error estimation is that in the 4th column of the table reported in KbT? I see the std. dev. reported in the second-last column, but this other error I don’t know exactly how it is estimated.

What about the error on the total DeltaG, the one I get in kJ/mol at the very bottom of the screen output? Is that a confidence interval, a standard error, or what else?

Thank you in advance, I appreciate; wish you a great day.

Bests,  
Jacopo