Hi Urszula, You can adjust the voxel size of your map in the Coordinates section of the Volume Viewer dialog (show this section using Volume Viewer menu: Features… Coordinates). <http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/volumeviewer/framevolumeviewer.html> <http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/volumeviewer/volumeviewer.html#coordinates> However, it is unclear what exactly the correct size should be. You may need to consult the source of the map. I hope this helps, Elaine ---------- Elaine C. Meng, Ph.D. UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco On Oct 27, 2014, at 5:47 AM, "Urszula Uciechowska" <urszula.uciechowska@biotech.ug.edu.pl> wrote:

Dear Chimera users,

I am trying to fit my protein structure onto an density map. I loaded both the map file and my model coordinates into Chimera. But it looks apparently that they are not in the same size scale. My model is much bigger than the size of my map region where the model is supposed to reside. I suspect the density map size is scaled down somehow.

I did a little research on internet but couldn't find a solution. Could you please advice me how to put them to the same size scale?

Best regards Urszula