Hi, I have a map with C15 symmetry in which I already refined the fitting of a single monomer (asymmetric unit) in the map using coot. I now want to generate the complete 15-mer atomic model. I watched your tutorial : ( https://youtu.be/v3jI43YJQMg?si=WeQg2ef2MPOw2J7H) and I tried to use the command "sym #2 (my model) C15 to do that, but instead of getting the monomers fitted around the axis of symmetry, I could see that 15 versions were visible but in a circular circumference around my map, away from the center, and the monomers are widely spaced from one another. I kind of expected this because I did not specify any coordinates to do this copying, so how can I fix this? Another question: when I use the command "measure symmetry" I get "C3, center 270 270 244". So I do not understand why it's detecting a C3 when it's clearly a C15. I think the above coordinates of the center can be used to solve my fitting problem but I am not exactly sure how. Finally I understood that even if the monomers appear properly fitted, given I manage to do it, that these are just graphical copies. So how can I then make real copies of the graphical representation of the 15-mer? Thanks Noha -- *Noha M. Elhosseiny, PhD* Department of Microbiology & Immunology Faculty of Pharmacy, Cairo University. Kasr El-Ainy St, Cairo, Egypt, 11562- Lab C-407 Website: https://eg.linkedin.com/in/nohaelhosseiny <https://eg.linkedin.com/in/nohaelhosseiny>