Hi Rakesh, Our volume expert is away right now, but I would suggest using the "Help... Report a Bug" dialog and attaching an example of a file needed to reproduce this problem. It may be that these files do not adhere to the MRC format, or at least as Chimera expects it. Please include your email address in the bugreport if you wish feedback when someone is able to look at this in more detail. I see a note in the documentation <http://www.cgl.ucsf.edu/chimera/docs/ContributedSoftware/volumeviewer/volumeviewer.html#mrcout> that MRC files output by Chimera are in MRC 2000 format, and "Older MRC-reading programs or programs expecting CCP4 format will read such files successfully but may not align the data correctly with other data sets." However, I don't know specifically what subtypes of MRC format are handled on input, or if some simple editing could solve the problem. Sorry I don't know more, 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 Aug 24, 2010, at 1:45 PM, rjoshi@purdue.edu wrote:
Hi, i am having problems loading electron density files from CCP4 and Phenix. The error message reads "Bad MRC grid size (129737328,-319356160,1145110528)". Please advise. Cheers Rakesh