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4.3.2.2 Main vertex position 

      REAL
     .     XYZS(3)              ! True vertex position.
      INTEGER
     .     NVTRK                 !*# of track in vertex
      REAL
     .     ECMS,                ! Total CMS energy generated
     .     XYZ(3),              ! fitted vertex position
     .     VCOV(6),             ! vertex covariance mat   ( see ZAUVF2 etc)
     .     VCOVM(6),            !*measured vertex covariance mat  "
     .     SFACT,               !*error scale factor        "
     .     NSGINI,              !I# of sigmas for sfact def "
     .     CHI2VX,              !*chi^2 of vertex
     .     PCUT,                !Iprob-cut to accept vertex

Mikael Berggren 2003-03-27