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258 bytes added ,  20:07, 8 July 2013
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* Another way to judge Wilson outliers is to identify resolution ranges that deviate from 1. in the table '''HIGHER ORDER MOMENTS OF WILSON DISTRIBUTION OF ACENTRIC DATA''' in [[CORRECT.LP]]. "Aliens" that are put into REMOVE.HKL will lower the values in these resolution ranges!
 
* Another way to judge Wilson outliers is to identify resolution ranges that deviate from 1. in the table '''HIGHER ORDER MOMENTS OF WILSON DISTRIBUTION OF ACENTRIC DATA''' in [[CORRECT.LP]]. "Aliens" that are put into REMOVE.HKL will lower the values in these resolution ranges!
 
* SCALEPACK users: don't confuse this process of rejecting Wilson outliers with the iterative procedure of rejecting scaling outliers that is usually done when using SCALEPACK. Scaling outliers are handled non-iteratively in [[XDS]]; the only way to influence [[XDS]] in this respect is by modifying [[WFAC1]].
 
* SCALEPACK users: don't confuse this process of rejecting Wilson outliers with the iterative procedure of rejecting scaling outliers that is usually done when using SCALEPACK. Scaling outliers are handled non-iteratively in [[XDS]]; the only way to influence [[XDS]] in this respect is by modifying [[WFAC1]].
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* if CORRECT rejects many "aliens" in a very weak high resolution shell because they have Z>20 then this is due to the fact that the reflections do not obey Wilson statistics. If this happens, the REJECT_ALIEN parameter should be set much higher (e.g. 100).
    
=== Optimizing the anomalous signal ===
 
=== Optimizing the anomalous signal ===
 
It may be helpful to increase WFAC1 from its default 1.0 to 1.5, to avoid rejection of the strongest Bijvoet pairs (this is not necessary when STRICT_ABSORPTION_CORRECTION=TRUE which is ''not'' the default).  
 
It may be helpful to increase WFAC1 from its default 1.0 to 1.5, to avoid rejection of the strongest Bijvoet pairs (this is not necessary when STRICT_ABSORPTION_CORRECTION=TRUE which is ''not'' the default).  
 
Read [[Tips_and_Tricks#SAD.2FMAD_data_reduction]] concerning STRICT_ABSORPTION_CORRECTION.
 
Read [[Tips_and_Tricks#SAD.2FMAD_data_reduction]] concerning STRICT_ABSORPTION_CORRECTION.
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