class AliEMCALTrack: public AliExternalTrackParam

 Default constructor.
 Sets to meaningless values the indexes corresponding to
 ESD seed track and matched cluster.

 Constructor from AliESDtrack

 Copy constructor.

 Compare tracks.
 How tracks are compared depends on the static flag
 "fSortByPt" (boolean):
 true  => tracks are compared w.r. to their transverse momentum
 false => tracks are compared w.r. to their distance from cluster

 Propagates a track to the plane defined by x='xk'.
 Second parameter is the width (in units of rad. length) crossed by the track.
 Third parameter is the reference radiation length used.
 Track propagation includes computing energy loss (modifies curvature)
 and multiple scattering perturbation (alters covariance matrix), if requested.
 Method returns kFALSE when something goes wrong with computations.

 An additional operation (thanks to Yuri Belikov) is done to check
 when the track crosses a sector boundary. If this happens,
 the local track reference frame is adjusted accordingly.

 Does propagation with a straight line approximation.
 This operation does not update track parameters, but it returns a point
 in space, according to this propagation, which is stored in
 the arguments #2, #3 and #4

 Propagate to a point specified with its global XYZ coordinates.
 Here, the correct value of the 'X' parameter to be sent to "PropagateTo" is computed.

 Recall base class method for track propagation.