[gmx-users] units of eigenvalues of mass-weighted covariance matrix

[Mark Abraham]

Wang Qin wrote:
> Dear all,
>      I am confused on the units of the eigenvalues calculated from 
> g_covar of mass-weighted covariance matrix. From the output, it says the 
> unit is  "(nm\S2\N)" but from my understanding, it is supposed to be kg/m2.

Various of the GROMACS analysis tools don't write the correct units in 
.xvg output. This looks like such a case. There's a section early in the 
manual that describes the GROMACS unit conventions, from which you
should be able to deduce what the units are.

Mark