OK also for define centroid ---------- Forwarded message ---------- From: Francesco Pietra <chiendarret@gmail.com> Date: Sun, Oct 12, 2014 at 3:11 PM Subject: Fwd: command @/serialNumber=# To: chimera <chimera-users@cgl.ucsf.edu> OK, for molecule 18801-18802 @/serialNumber>18800 and serialNumber<18803 it remains to be seen if it can be used to define a centroid fp ---------- Forwarded message ---------- From: Francesco Pietra <chiendarret@gmail.com> Date: Sun, Oct 12, 2014 at 7:05 AM Subject: command @/serialNumber=# To: chimera <chimera-users@cgl.ucsf.edu> Hello: I wonder whether it is possible to extend the command sel @/serialNumber=18801 (as an example of a particular serial number) to comprise a range of atoms. So as to cover, for example, an entire ligand, may be dioxygen, 18801-18802. And whether that could be extended to define a centroid. it is implied that I have prepared a large system based on segname (charmm ff with namd), which is not dealt with by chimera. thanks francesco pietra PS: I can follow the ligand by defining the centroid for a single atom of the ligand. This would be my last resource.