[Chimera-users] problems loading .mtz files

Elaine Meng meng at cgl.ucsf.edu
Tue Aug 24 14:27:41 PDT 2010

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
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 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 at 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

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