# Number of pair interactions

**URL:** <https://gromacs.bioexcel.eu/t/number-of-pair-interactions/2086>\
**Category:** User discussions\
**Tags:** mdrun\
**Created:** [May 3, 2021, 5:06pm UTC](https://gromacs.bioexcel.eu/t/number-of-pair-interactions/2086 "2021-05-03T17:06:39Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![juanjogf](https://avatars.discourse-cdn.com/v4/letter/j/e95f7d/32.png) [@juanjogf](https://gromacs.bioexcel.eu/u/juanjogf)\
**Post date:** [May 3, 2021, 5:06pm UTC](https://gromacs.bioexcel.eu/t/number-of-pair-interactions/2086/1 "2021-05-03T17:06:39Z")

</div>

GROMACS version: 5.1.4  
GROMACS modification: No

Hello dear Gromacs supporters and users,

Although I knew (from a previous reply of Justin to a user in this forum) that the long-range Disp-corr (PME) term is not possible to breakdown into its individual energetic contributions terms, wouldn’t be possible to have/know an approximate number of the interactions (protein-protein, proten-nonprotein or nonprotein-nonprotein) accounted for when a given energy (e.g. the entahlpy of a trajectory) is obtained in a simulation??

Thanks in advance.