Hi, I have a density map in mrc format and a model in pdb format. I would like to calculate the average density within a 3D window centered at the coordinates of each atom in the model and include the result as an attribute for the atom. Despite some effort searching for the answer, I cannot find out how to do this easily. I could try and go deep into Python programming but, before I reinvent the wheel, I'd like to know whether there already is a simpler way to do this in Chimera. Thanks! Mario -- +---------------------------------+ | Mario J. Borgnia, Ph. D. | | | | Lab of Cell Biology | | NIH NCI/CCR | | 50 South Drive Rm 4306 MSC 8008 | | Bethesda MD 20892-8008 | | | | Tel: (301) 594 0563 | | mborgnia@nih.gov | +---------------------------------+