Hellp all,

Recently i have successfully run the GROMACS coomand for PCA analysis of protein-ligand complex. But, there are plenty of publication indicated "Trace value" in thier result. I also got "Trace value" in my result which is as follows:

Trace of the covariance matrix before diagonalizing: 4.21268

Trace of the covariance matrix after diagonalizing: 4.21268

Kindly let me how can i interpret these value, and should i sum the above both value?

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