# Combined RMSD and Rg

**URL:** <https://gromacs.bioexcel.eu/t/combined-rmsd-and-rg/7867>\
**Category:** User discussions\
**Created:** [December 15, 2023, 6:48am UTC](https://gromacs.bioexcel.eu/t/combined-rmsd-and-rg/7867 "2023-12-15T06:48:02Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![SP06](https://avatars.discourse-cdn.com/v4/letter/s/ecb155/32.png) [@SP06](https://gromacs.bioexcel.eu/u/SP06)\
**Post date:** [December 15, 2023, 6:48am UTC](https://gromacs.bioexcel.eu/t/combined-rmsd-and-rg/7867/1 "2023-12-15T06:48:02Z")

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GROMACS version: 2021.4  
GROMACS modification: Yes/No  
Here post your question : The first MDrun was for 30ns (md\_0\_1.tpr). As I wanted the run for 50ns, so i extended the run by 20ns more (md\_1\_2.tpr). For RMSD analysis, I want the plot to be for total of 50ns, but I am getting it either for 0-30ns or 30-50ns. How to get the RMSD plot for the entire 50ns on the same plot? Can anyone please help with this.

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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:** [December 15, 2023, 7:13am UTC](https://gromacs.bioexcel.eu/t/combined-rmsd-and-rg/7867/2 "2023-12-15T07:13:56Z")

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Concatenate the two trajectory files with `trjcat`.

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**Author:** ![SP06](https://avatars.discourse-cdn.com/v4/letter/s/ecb155/32.png) [@SP06](https://gromacs.bioexcel.eu/u/SP06)\
**Post date:** [December 17, 2023, 5:10am UTC](https://gromacs.bioexcel.eu/t/combined-rmsd-and-rg/7867/3 "2023-12-17T05:10:53Z")

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Thank you very much.