Editing Elbow angle (section)

==Implementation==
The elbow angle is the angle between the pseudo-twofold axes between the light and heavy chain variable and constant domains, respectively.  The rotation matrix to superpose VL onto VH and CL onto CH are calculated and the vectors corresponding to the rotation axes are determined (using Christoph Gohlke's [[transformations|transformations.py]]).  The elbow angle is the obtuse angle obtained by taking the arccos of the dot product of the two vectors.  For consistency, the elbow angle is reported as less than 180&deg; when the cross product of the Variable and Constant domain rotation axis vectors ( '''V''' &#10799; '''C''' ) is a vector pointing the same direction as that from the limit_h residue alpha carbon atom to the limit_l alpha carbon atom.

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