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In the Ranking Method, estimators are listed in the order of their estimator values.

The Ranking algorithm goes through the list removing candidates with larger estimator values if they share photons with other candidates.

 *** BEFORE RANKING ***

    Pion  Photon  Truth 
 #  est.   1  2   info. 

 A  0.05  A1 A2   TRUE 
 B  0.14  B1 B2   TRUE 
 X  0.18  D1 E1   FALSE
 C  0.24  C1 C2   TRUE 
 Y  0.29  A1 B2   FALSE 
 D  0.33  D1 D2   TRUE 
 Z  0.47  C2 E2   FALSE 

 *** AFTER RANKING ***

    Pion  Photon  Truth 
 #  est.   1  2   info. 

 A  0.05  A1 A2   TRUE 
 B  0.14  B1 B2   TRUE 
 X  0.18  D1 E1   FALSE
 C  0.24  C1 C2   TRUE 

Pion A removes pion Y from the list as they both share photon A1.
Pion X removes pion D from the list as they both share photon D1.
Pion C removes pion Z from the list as they both share photon C2.