Dear Tofayel, Our map expert is away this week and next week. All I can suggest is to take a look at this previous post (which you may have seen already): <http://www.cgl.ucsf.edu/pipermail/chimera-users/2016-June/012366.html> There is also a “localFSC” plugin to Chimera that you could get separately, see: <http://www.rbvi.ucsf.edu/chimera/plugins/plugins.html> … however, I don’t know if it is relevant to your question. Sorry I couldn’t provide a more confident answer, Maybe other EM folks on this list will have some thoughts. Best, 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 Apr 28, 2017, at 6:09 AM, #AHMED TOFAYEL# <TOFAYEL001@e.ntu.edu.sg> wrote:
Dear all, If I want to calculate FSC curve between experimental cryo EM map and model, what is the correct procedure to do so?
I will explain what I have tried so far. Although I have variable local resolution in my map, according to FSC=0.143 criterion I have a 4 Ang map (say 1.mrc), I have used 'molmap' command in Chimera to generate a simulated map at 4 Ang. Then I used "vop resample" to take care of the pixel and box values ( then saved as 2.mrc). Thereafter, I have used "e2proc3d.py 1.mrc fsc.txt --calcfsc=2.mrc and plotted the fsc.txt file to get the curve.
I am not sure if I am on the right track. My pixel size is 1.28. Best regards, Tofayel