class AliStack: public TVirtualMCStack

 Default constructor

  Constructor

 Copy constructor

 Destructor

 Load a track on the stack

 done     1 if the track has to be transported
          0 if not
 parent   identifier of the parent track. -1 for a primary
 pdg    particle code
 pmom     momentum GeV/c
 vpos     position
 polar    polarisation
 tof      time of flight in seconds
 mecha    production mechanism
 ntr      on output the number of the track stored

 Load a track on the stack

 done        1 if the track has to be transported
             0 if not
 parent      identifier of the parent track. -1 for a primary
 pdg         particle code
 kS          generation status code
 px, py, pz  momentum GeV/c
 vx, vy, vz  position
 polar       polarisation
 tof         time of flight in seconds
 mech        production mechanism
 ntr         on output the number of the track stored

 New method interface:
 arguments were changed to be in correspondence with TParticle
 constructor.
 Note: the energy is not calculated from the static mass but
 it is passed by argument e.

 Returns next track from stack of particles

 Returns i-th primary particle if it is flagged to be tracked,
 0 otherwise

 Compress kinematic tree keeping only flagged particles
 and renaming the particle id's in all the hits

 In some transport code children might not come in a continuous sequence.
 In this case the stack  has  to  be reordered in order to establish the
 mother daughter relation using index ranges.

 Some particles have to kept on the stack for reasons motivated
 by physics analysis. Decision is put here.

 Write out the kinematics that was not yet filled

 Flags a track and all its family tree to be kept

 Flags a track to be kept

 Reset stack data except for fTreeK

 Reset stack data including fTreeK

 Resets stack arrays

 Set high water mark for last track in event

 Return particle with specified ID

 return pointer to TParticle with label id

 Return entry number in the TreeK for particle with label id
 Return negative number if label>fNtrack

 The order of particles in TreeK reflects the order of the transport of primaries and production of secondaries:

 Before transport there are fNprimary particles on the stack.
 They are transported one by one and secondaries (fNtrack - fNprimary) are produced.
 After the transport of each particles secondaries are written to the TreeK
 They occupy the entries 0 ... fNtrack - fNprimary - 1
 The primaries are written after they have been transported and occupy
 fNtrack - fNprimary .. fNtrack - 1

 Return number of the parent of the current track

 Return number of primary that has generated track

 Dumps particle i in the stack

 Dumps the particle stack

 Dumps the particle in the stack
 that are loaded in memory.

 Clean particles stack
 Set parent/daughter relations

 Return next particle from stack of particles

  Creates branch for writing particles

 Get new event from TreeK

 Decide whether particle (pdg) is stable

 Test if a particle is a physical primary according to the following definition:
 Particles produced in the collision including products of strong and
 electromagnetic decay and excluding feed-down from weak decays of strange
 particles.