Matrix of similar interfaces for 3D-footprint entry 6nn6_D

_ stats: contacts=2 Nring=0 specif=-1.00
_ PDBs:  1:9fgq_D,2:8u14_G,3:8txv_G,
_ -lnE:  1:13.6,2:10.9,3:10.5,
_        1 2 3
0001 R  RT----
0021 G  --RTRG