Hi: I was trying to detect all residues (or atoms) within a given distance from a single-atom ligand in model #0 (PDB file). There are several such single-atom ligand atoms in model #0 (practically invisible in chimera as they are not shown at their relative vdw size), each specified by different residue and atom numbers. I want to carry out the task for each single-atom residue. Therefore I can't use the standard command select #0:single-atom-ligand z(or za)<given.distance because that applies to all those single-atom-ligands. Unless the residue can be specified differently (the residue number in place of residue name did not work), the only way that I found to come out was to set different names for the different single-atom ligands. Is anything better? Secondary question: is there any plan to support psf/dcd format (which I am now using for MD with namd) beyond reading movies? Thanks francesco pietra