How to extract the coordinates of gmx traj command

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I have the following command which plots the center of mass against simulation time, for protein. Please how can I extract these points (coordinates) of the graph possibly as a text file to analyse on my own?

gmx traj -f {1}.xtc -s {1}.tpr -n COM.ndx -x no -y no -com -ox com_protein_${X}.xvg <<<Protein

2

The output .xvg file specified by the -ox argument is a text file with these coordinates.