[gmx-users] A question on x, y axis of order parameters (g_order)

[Hwankyu Lee]

Dear, gmx-users,

I'm using g_order to get order parameters, and could look at reasonable 
results based on z-axis.
However, I'm curious about order parameter results of x,y axis. I think 
they should be symmetrical, due to thetaX = 90 - thetaY, but it doesn't 
look like what I expected. Especially, theta values from Sx, Sy were 
not matching to each other.
The gromacs manual explains that "the parameters Sx and Sy are defined 
in the same way".   Sx and Sy are calculated by different ways??  Could 
you give me any explanation on that?

best,
Hwankyu.
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