NSP bin

[research user]

What is the role of NSP bin in the protein prophet results, how the
value is assigned to it and how that value should be interpreted for
concluding protien identifications.
 I could understand the importance of NSP (number of sibling peptides) in
assigning a correct protein identification. My question is what is the need of NSP bin and how it works.

If someone can throw some light on this.
thanks
Kanchan