[Rivet] Leading neutrinos?

[David Grellscheid]

Hi again,

ATLAS_2010_S8919674 (W+jets) uses a LeadingParticlesFS to make up 
pTmiss. Does that make sense? Shouldn't I add all neutrinos? How would I 
even know how the experimental pTmiss divides over the neutrinos?

   David