[Chimera-users] Measuring angles between atoms pairs

Dear Chimerians... I'm running an analysis about H-bonds geometries in several models. I need to measure the distance of a H-bond and the angle formed with a third atom bonded to one of the H-bond atoms. How could I do that in a python IDLE/script? In a more general way, how could I measure the angle between three atoms linked by a bond o pseudobond? Thanks in advance Yasser -- Yasser Almeida Hernández, BSc. Center of Molecular Immunology (CIM) Tumor Biology Department 216 St.& 15th Ave, Siboney, Playa P.O.Box 16040, Havana 11600 CUBA Phone: (+53-7) 214-3178 almeida@cim.sld.cu<mailto:almeida@cim.sld.cu>