What is the Y-axis depicted exactly during calculation of RMSD distribution using "g_cluster" of Gromacs Package?

16 April 2015 1 6K Report

During calculation of RMSD distribution using "g_cluster", the Y axis of the XVG file denotes a.u. i.e arbitrary unit which I think probably the frequency. But it is not clear which frequency it exactly is as well as how the calculation happened.

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