Regarding Principal Component Analysis (PCA)

GROMACS version: 2019
GROMACS modification: Yes/No
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I have performed PCA analysis for Protein-ligand complex structure in Gromacs. I have plotted a 2D graph eigenvector1 VS eigenvector2 ( I have attached image Protein-SASA)

How to plot the Eigenvector Index graph? (as shown in the image eigenvector_Index)Eigenvector_index

Kindly share the steps and commands to plot the Eigenvector Index graph, it will be of great help! Thank you

The file you are looking is eigenval.xvg. It is generated by gmx covar and you can plot it with xmgrace or with other plotting tools.
Best regards

@alevilla Thank you very much for your reply, I will surely check now