GROMACS version: 2020.1

GROMACS modification: No

Hi,

I am using `gmx h2order`

to calculate orientational parameters of TIP3P water molecules. In the the output .xvg file, the y axis is “mu_x, mu_y, mu_z (D), cosine with normal”. “mu_x, mu_y, mu_z” I suppose are the cosine with respect to each axis. What does the “D” in mu_z means? What is the normal of the box for this command? (Z axis?). Then, what the last column means?

Thanks in advance,

-Yasser