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Dear Crystallographers, I have seen many demonstrations of the primacy of phase information for determining the outcome of fourier syntheses, but have not been able to understand intuitively why this is so. Amplitudes as numbers presumably carry at least as much information as phases, or perhaps even more, as phases are limited to 360deg, whereas amplitudes can be anything. Does anybody have a good way to understand this? One possible answer is "it is the nature of the Fourier Synthesis to emphasize phases." (Which is a pretty unsatisfying answer). But, could there be an alternative summation which emphasizes amplitudes? If so, that might be handy in our field, where we measure amplitudes... Regards, Jacob Keller ******************************************* Jacob Pearson Keller Northwestern University Medical Scientist Training Program Dallos Laboratory F. Searle 1-240 2240 Campus Drive Evanston IL 60208 lab: 847.491.2438 cel: 773.608.9185 email: [log in to unmask] *******************************************