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I favour measuring a symmetry related reflection - it is more likely to have different systematic error. But if you after Friedel differences there is some argument for measurng hkl and -h-k-l in the same orientation.. However high redundancy if you can achieve it always seems to me to give the best overall data set - high redundancy also gives you a statistical basis for rejecting outliers. Eleanor Francis E Reyes wrote: > For a given reflection (h,k,l) how much does each situation increase > the redundancy ? and which maximizes the ability to measure anomalous > differences? (so assume we're separating friedel pairs here) > > > a) measuring the same reflection again > > b) measuring a symmetry related reflection > > c) both a+b > > Thanks! > > FR > > --------------------------------------------- > Francis Reyes M.Sc. > 215 UCB > University of Colorado at Boulder > > gpg --keyserver pgp.mit.edu --recv-keys 67BA8D5D > > 8AE2 F2F4 90F7 9640 28BC 686F 78FD 6669 67BA 8D5D > >