//==============================================================================
// TEvePathMark
//==============================================================================

//______________________________________________________________________________
//
// Special-point on track:
//  kDaughter  - daughter creation; fP is momentum of the daughter, it is 
subtracted from
//               momentum of the track
//  kReference - position/momentum reference
//  kDecay     - decay point, fP not used
//  kCluster2D - measurement with large error in one direction (like strip 
detectors):
//               fP - normal to detector plane,
//               fE - large error direction, must be normalized.
//               Track is propagated to plane and correction in fE 
direction is discarded.