[ccp4bb] delete reflections with negative peak profile correlation

[<Rain Field>]

Hi All,
Inspired by the "micro diffraction assembly" methods (see 
http://www.nature.com/nature/journal/vaop/ncurrent/full/nature12357.html), I 
checked one XDS_ASCII.HKL file and found many reflections has negative peak 
profile correlation. After deleted them and rerun XSCALE, I/sigma is higher and 
Rmeas is lower in the same high resolution shell than without deletion. 
I am wondering why it's not a common practice to delete those reflections?
Thanks!