I would calculate an omit map. Delete your ligand and use the resulting pdb file to calculate a map. Density for your ligand will show up as positive difference density. Herman
________________________________ From: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of RONG hui Rong Sent: Friday, August 26, 2011 4:44 PM To: CCP4BB@JISCMAIL.AC.UK Subject: [ccp4bb] Closed density map Dear all, Do you know how to generate some closed density map (mesh) that can wrap ligand without tangling with electron density map of other residues? Many Thanks! Hui