It is already vertical, relative to the real part of Fa (in red), i.e. the blue vector is always vertical to the red vector in this picture (and counter-clockwise).
Yong William Scott <[email protected]> Sent by: CCP4 bulletin board <[email protected]> 10/13/2010 01:48 PM Please respond to William Scott <[email protected]> To [email protected] cc Subject [ccp4bb] embarrassingly simple MAD phasing question Hi Citizens: Try not to laugh. I have an embarrassingly simple MAD phasing question: Why is it that F" in this picture isn't required to be vertical (purely imaginary)? http://www.doe-mbi.ucla.edu/~sawaya/tutorials/Phasing/phase.gif (Similarly in the Harker diagram of the intersection of phase circles, one sees this.) I had a student ask me and I realized that there is this fundamental gap in my understanding. Many thanks in advance. -- Bill William G. Scott Professor Department of Chemistry and Biochemistry and The Center for the Molecular Biology of RNA 228 Sinsheimer Laboratories University of California at Santa Cruz Santa Cruz, California 95064 USA phone: +1-831-459-5367 (office) +1-831-459-5292 (lab) fax: +1-831-4593139 (fax)
