The traditional benefit was in reducing absorbtion errors. This obviously depends on crystal path, and seeing it is hard to model well, one way to mitigate the errors was to average equivalents collected at different settings. The error was still there, but assuming random distribution about the true intensity, averaging helps..
On 15 May 2013 10:20, Colin Nave <colin.n...@diamond.ac.uk> wrote: > Oh – I seemed to have diverted Frank’s thread. > > Fortunately most languages themselves are highly redundant, with following > characters and words being quite predictable. The entropy and redundancy of > English language was analysed by Shannon (with the help of his wife) and > he obtained figures of about 1 bit per character rather than log base 2 > (27), a redundancy of around 75%. I guess this redundancy helps us put > things in context. However, in order to avoid future misunderstandings, I > would like to suggest that further communications with CCP4BB be done in > Latin which I believe has less ambiguity. I hope people will adopt this > helpful suggestion. > > OK – perhaps not a good idea. More relevant to Frank’s question, I was > referring to cases where, for a particular reflection, the path of x-rays > through the crystal was altered to average out systematic errors. What type > of systematic errors would be mitigated by this? There is one potential > addition to the list (absorption errors, detector calibration) I produced > but it applies to synchrotron sources rather than the type of x-ray source > used in the Acta D paper. I will let others have a think before suggesting > it. > > Colin >
