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$LIBE group (required if linear bends are used in $ZMAT)
A degenerate linear bend occurs in two orthogonal planes, which are specified
with the
help of a point A. The first bend occurs in a plane containing the atoms I,J,K
and the user
input point A. The second bend is in the plane perpendicular to this, and
containing
I,J,K. One such point must be given for each pair of bends used.
APTS(1)= x1,y1,z1,x2,y2,z2,... for linear bends 1,2,...
Note that each linear bend serves as two coordinates, so that if you enter 2
linear bends
(HCCH, for example), the correct value of NZVAR is M-2, where M=3N-6 or 3N-5, as
appropriate.