[gmx-users] tilt angle between the axis of a protein normal to the membrane

[Alex Mathew]

 Dear gromacs users,

I would like to  calculates the tilt angle between the axis of a protein
(its a nanotube, embedded perpendicular to the lipids-along z) and the
normal to the membrane .

I have used gmx gangle -f XXX.xtc -s XX.tpr -g1 vector -g2 z -oav
angle.xvg, is it correct approach?