class AliITSgeomTGeo: public TObject

 The method is taken from the old AliITSgeom class by Bjorn Nilsen

 This routine computes the module index number from the layer,
 ladder, and detector numbers. The number of ladders and detectors
 per layer is set statically
 see above for details.
 Inputs:
    Int_t lay  The layer number. Starting from 1.
    Int_t lad  The ladder number. Starting from 1.
    Int_t det  The detector number. Starting from 1.
 Return:
    the module index number, starting from zero.
    -1 in case of error

 The method is taken from the old AliITSgeom class by Bjorn Nilsen

 This routine computes the layer number for a
 given the module index. The number of ladders and detectors
 per layer is defined statically,
 see above for details.
 Inputs:
     Int_t index  The module index number, starting from zero.
 Outputs:
     Int_t index2 The module index inside a layer, starting from zero.
     Int_t lay    The layer number. Starting from 1.
 Return:
     kTRUE in case of valid index
     kFALSE in case of error

 The method is taken from the old AliITSgeom class by Bjorn Nilsen

 This routine computes the layer, ladder and detector number
 given the module index number. The number of ladders and detectors
 per layer is defined statically,
 see above for details.
 Inputs:
     Int_t index  The module index number, starting from zero.
 Outputs:
     Int_t lay    The layer number. Starting from 1.
     Int_t lad    The ladder number. Starting from 1.
     Int_t det    The detector number. Starting from 1.
 Return:
     kTRUE in case of valid index
     kFALSE in case of error

 Get the TGeoPNEntry symbolic name
 for a given module identified by 'index'

 Get the transformation matrix for a given module 'index'
 by quering the TGeoManager

 Get the translation vector for a given module 'index'
 by quering the TGeoManager

 Get the rotation matrix for a given module 'index'
 by quering the TGeoManager

 Get the original (ideal geometry) TGeo matrix for
 a given module identified by 'index'.
 The method is slow, so it should be used
 with great care.

 Get the original translation vector (ideal geometry)
 for a given module 'index' by quering the TGeoManager

 Get the original rotation matrix (ideal geometry)
 for a given module 'index' by quering the TGeoManager

 Get the matrix which transforms from the tracking to local r.s.
 The method queries directly the TGeoPNEntry

 Get the matrix which transforms from the tracking r.s. to
 the global one.
 Returns kFALSE in case of error.

 Get a pointer to the TGeoPNEntry of a module
 identified by 'index'
 Returns NULL in case of invalid index,
 missing TGeoManager or invalid symbolic name

 Make the conversion from the local sensitive reference system to the global
 reference system, for an arbitrary local position. The input is the pointer
 to the array of local coordinates, the result is sent to the glob pointer.

 Please don't use this method to get the global coordinates of clusters, use
 the direct method of AliCluster instead.

 Make the conversion from the global reference system to the sensitive local
 reference system, for an arbitrary global position. The input is the pointer
 to the array of global coordinates, the result is sent to the loc pointer.

 Make the conversion from the local sensitive reference system to the global
 reference system, for an arbitrary vector. The input is the pointer to the
 array of local coordinates, the result is sent to the glob pointer.

 Make the conversion from the global reference system to the sensitive local
 reference system, for an arbitrary vector. The input is the pointer to the
 array of global coordinates, the result is sent to the loc pointer.

 This function returns the total number of ITS modules

 This function returns the number of detectors/ladder for a given layer

 This function returns the number of ladders for a given layer

 This function returns the number of layers

 This function returns a pointer to the TGeoHMatrix (local->global)
 of a given module index

 This function returns a pointer to the original TGeoHMatrix (local->global)
 for a specific module index