Matrix of similar interfaces for 3D-footprint entry 6kw4_Y

_ stats: contacts=4 Nring=3 specif=0.75
_ PDBs:  1:6kw4_Y,2:6ryu_V,3:8wha_K,4:7aud_E,
_ -lnE:  1:58.2,2:45.8,3:45.6,4:7.3,
_        1 2 3 4
0149 E* EG----ET
0304 N  ----NG--
0390 S* SC------
0418 R* RGRCRC--