class HKalTrackSite: public TObject

 Creates a dummy hit and track states.
 measDim:  dimension of measurement vector.
 stateDimSec: dimension of the track state vectors in the sector coordinate system.
 stateDimVirtLay: dimension  of the track state vectors in the virtual layer coordinate system.

 Get hit at index idx that this site contains.

 Transform the measurement hit coordinates and layer vectors
 using the rotation matrix transMat.

 Transform the track state vectors using the rotation matrix transMat.
 Since information about the measurement layer is needed, make sure
 the hit has not been transformed yet.

 Add a new hit to this site.

 Track states can be stored in two coordinate systems:
 the sector coordinate system common for all sites and a local
 coordinate system for this site defined by a virtual plane.
 This calculated the Jacobian matrix for the transformation
 function from virtual layer to sector coordinates.

 Output:
 jac:   Jacobian matrix

 Input:
 svSec: State vector in virtual layer coordinates.
 plane: Virtual layer.

 Track states can be stored in two coordinate systems:
 the sector coordinate system common for all sites and a local
 coordinate system for this site defined by a virtual plane.
 This calculated the Jacobian matrix for the transformation
 function from sector to virtual layer coordinates.

 Output:
 jac:   Jacobian matrix

 Input:
 svSec: State vector in sector coordinates.
 plane: Virtual layer.

 Prints information about the hit and track states for this site.
 opt: Determines what information about the object will be printed.
 If opt contains:
 "Hit": print information about hit's measurement coordinates and layer
 "Pred": print state vector and used matrices of the predicted state
 "Filt": print state vector and used matrices of the filtered state
 "Smoo": print state vector and used matrices of the smoothed state
 "Inv":  print state vector and used matrices of the inverse filtered state
 If opt is empty all of the above will be printed.
 Only the state vector and covariance matrix are printed for all states.
 The content of unused matrices will not be printed:
 The propagator and process noise matrices are always stored in the filtered state.
 The projector matrix is stored in class HKalSystem.
 idx: Index of hit object in site.

 Transform the track state vectors and measurement hit coordinates
 and the hit's measurement layer using the rotation matrix transMat.

 Track states can be stored in two coordinate systems:
 the sector coordinate system common for all sites and a local
 coordinate system for this site defined by a virtual plane.
 This functions calculates and stores the track state and
 covariance matrix in virtual layer coordinates from sector.

 Input:
 stateType: state to transform (kPredicted, kFiltered, kSmoothed, kInvFiltered)
 iHit:      index of hit stored in site
 bCovUD:    set to true if using the UD filter.

 Track states can be stored in two coordinate systems:
 the sector coordinate system common for all sites and a local
 coordinate system for this site defined by a virtual plane.
 This functions calculates and stores the track state and
 covariance matrix in sector coordinates from virtual layer.

 Input:
 stateType: state to transform (predicted, filtered, etc.)
 iHit:      index of hit stored in site
 bCovUD:    set to true if using the UD filter.

 Return the measurement covariance matrix.

 idx: The index of the hit stored in this measurement site.
      -1 will return the effective covariance which is
      used for the annealing filter. This matrix is a weighted
      mean of the measurement errors of all competing
      hits and must be calculated by calling the calcEffErrMat()
      function beforehand.

 Get hit at index idx that this site contains.

 Returns the sum of the weights from all hits in this site.

 Return the hit vector (measurement vector).

 idx: The index of the hit stored in this measurement site.
      -1 will return the effective measurement which is
      used for the annealing filter. The effective measurement
      is a weighted mean of the measurements of all competing
      hits and must be calculated by calling the calcEffMeasVec()
      function beforehand.

 Change number of DAF iterations.

 Extracts a position and direction vector from a track state's parameters.

 Output:
 pos:       returns the hit coordinate vector
 dir:       returns the track direction vector
 Input:
 stateType: track state type (kPredicted, kFiltered, kSmoothed, kInvFiltered)