I do umbrella sampling for different distances of AA perpendicular to nanotube axis. Imagine nanotube is along Y axis and i want to pull AA along just Z axis. But during pulling (i mean most of the time) it trapped in X axis and pulls along x axis. I used pull_vec= 0 0 1 and pull_geometry= direction, force constant= 5000 . How can i make it to move just along Z axis? Would you please help me?
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