* Vertex re-fitting for a given set of tracks 
 
 Daniel: tracks -> PFOs -> LCFI -> vertex fit -> chi2, position, error
   => github of tautau benchmark for example
 
 Taikan: planning to do something similar as a Processor? ~few days  => new release of LCFIVertex
   
 Medium term: light-weight utility to fit tracks on a common vertex, independent of LCFIVertex
              => convert Mikael's Billoir fit from fortran? 


* Truth question:
  
  example from Yan => follow-up

* missing muons in Pandora:
   
  Remi: cluster fit in yoke fails => yoke hits discarded - or neutral cluster? 
  
  Frank: ECal/HCal hits not used? 

  need more diagnosis !!!
  => possibly real fix for future
  => work-around for analyses?