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entry variable: $ncthresh -- norm comp thresh
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default: 0.02

The entry to the right of "nc" (F3 panel, middle
bottom) sets the threshold movement below which
the normal component (of total resultant neighbor
force) is zeroed.

No effect unless "nc" ($ncthreshflag) is ticked.

Used to dampen oscillating ripples in unfolded
surface (orig for quadrangular surface).
