These files are the interface CA atom coordinates extracted from thosed
superposed PDB files. They can be used to calculate the Root Mean Square
Deviation (RMSD) of your prediction from correct coordinates. The interface
was defined as all residues with at least one atom located within 10
angstrom of the other protein. file_r.b.ca means that it is the interface 
CA atom coordinates file of the superposed receptor. file_l.b.ca means that 
it is the interface CA atom coordinates file of the superposed ligand. 
