Dear ChimeraX Developers,

I was wondering if you could explain to me how to measure the contact residues/area in a pdb file containing an antibody and antigen?  I have been trying to do either measure buriedArea or contactArea, but I get an error.  I have been using the PDB file 7Y0W as a starter structure to then use for future structures. 

Let me know if you need anything else.

Thank you for all your help.

Geoffrey Shimberg