You need to specify "n1=?" and "n2=?" the first and the second atom, respectively and also "r=?" for the position of this atom between the two atoms (r=0.0 add an atom in n1 and r=1.0 add an atom in n2). $biss: add 1 dummy atom # (nb=1) at 0.5 (norm=0.5) from 1, such the vector 1-# is the bisector of the vectors 1-2 and 1-3. Then on the next ligne(s) ("nb" lines) the atoms involve in the "nb" operation(s) You need to specify the number of operation "nb=?" and "norm=?" in the namelist (nb=1 and norm=1.000 default). $proj: add a dummy atom # from 4 such the vector 4-# is the projection of the vector 4-5 on the plan 1-2-3. $prod: add a dummy atom # at 1.000 (Ångström or Bohr) from 2 such the vector #-2 is perpendicular to the vectors 3-2 and 1-2 (vector product). $dihe: calculate 1 dihedral angle (nb=1) between atoms 5 1 2 3 (the angle between the plans 5-1-2 and 1-2-3). $angl: calculate 1 valence angle (nb=1, default) between atoms 3, 2 and 1. $dist: calculate 2 distances (nb=2) between atoms 1-2 and 1-3. Then on the next line(s) ("nb" lines) the atoms involve in the "nb" operation(s). You need to specify the number of operation "nb=?" (nb=1 default) in the namelist.
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