# How to understand the output after pulling force is applied?

**URL:** https://gromacs.bioexcel.eu/t/how-to-understand-the-output-after-pulling-force-is-applied/10146
**Category:** User discussions
**Tags:** mdp-parameters, analysis-tools, pull-code
**Created:** [September 12, 2024, 12:22pm UTC](https://gromacs.bioexcel.eu/t/how-to-understand-the-output-after-pulling-force-is-applied/10146 "2024-09-12T12:22:37Z")
**Posts on this page:** 1
**Showing post:** 6

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### Author: ![MagnusL](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/magnusl/32/2380_2.png) [@MagnusL](https://gromacs.bioexcel.eu/u/MagnusL)
#### Post date: [September 16, 2024, 5:41am UTC](https://gromacs.bioexcel.eu/t/how-to-understand-the-output-after-pulling-force-is-applied/10146/6 "2024-09-16T05:41:34Z")

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I don’t think you should compare the `COM Pull En.` output with the work of the pulling potential. If they are “almost the same” but one with negative value, I would think it might be more of a coincidence. Does [What does "COM-pull-energy" mean in the pulling process](https://gromacs.bioexcel.eu/t/what-does-com-pull-energy-mean-in-the-pulling-process/4669) help?

Otherwise, could you post your `COM Pull En.` plot (and the output from `gmx energy`) along with the pullx.xvg plot and the value of the constant force you are pulling with?

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