Combined RMSD and Rg

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.

Concatenate the two trajectory files with trjcat.

Thank you very much.