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LITlib - Excel Power Functions Pack
Add-in for Excel that adds additional cell functions to Excel.

litLIB Help - DihedralAngle function
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Numeric - DihedralAngle

DihedralAngle(Point1, Point2, Point3, Point4 [, RadDeg] )

Returns the dihedral angle of the angle defined by the four points.

The dihedral angle is the angle between two planes. The first plane is defined by points 1, 2 and 3. The second plane is defined by points 2, 3 and 4.

PointN: XYZ coordinates of atom N.
RadDeg: Return the angle in radians (=0) or degrees (= 1)