Hi Michael, I develop the Chimera volume data display and file readers. If you would like Chimera to read IMAGIC-5 format I can probably add that. Your documentation looks good. Is it generally the case that the header file (suffix ".hed") and image file (suffix ".img") are in the same directory? I ask because opening files in Chimera is done by giving a single file path (could be your header file or raw image data file), and it will have to find the related file. To write the file reader I would need one or a few example files to test with. I am working on many projects. This file reader might take 1 to 2 days which could be done some time in the next couple months. I think this will be useful to the EM community and I will be happy to discuss any other file format issues related to EM2EM and Chimera. Tom