This is code based on Abhi Raghavan's packing angle program to calculate the VH/VL domain packing angle as described in:
Abhinandan, K.R. and Martin, A.C.R. (2010) 'Analysis and Prediction of VH/VL Packing in Antibodies', Protein Engineering Design and Selection, 23, 689-697.
Compiling the program requires a copy of http://github.com:/ACRMGroup/bioplib.git