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     Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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                            GFLASHa Example 
                            ---------------

The Example demonstrating usage 'gflash' shower parameterisation
in homogeneous calorimeter.Compare with glash1,2,3 in this
example histograms was added. This makes it possible to use this
example for fine tuning of GFLASH parameters.
 This example allow compare the shower profiles from fast simulation
with full simulation by histograming of longitudinal (slice)
and radial profiles with different "binning".
Then GFlash fast simulation can be "tuned" via modification
of the model parameters file:

include/ExGflashHomoShowerTuning.hh

in this example.

GEOMETRY DEFINITION
------------------- 

In this example the calorimeter is a simple cube,
which consists of 10 x 10 crystals of PbWO4 (CMS like).

Geometry, sensitive detector and hits are defined respectively in:
 ExGflashDetectorConstruction
 ExGflashSensitiveDetector
 ExGflashHit

Materials can be choosen from Nist Materials: G4_Air G4_WATER ...
eg: /exgflash/det/setMat G4_PbWO4 see also: csi1.mac 

HIT SCORING
-----------

The virtual cylinder sliced longitudinally (slice) and radially (ring) was used.
The size of the slices and rings are expressed in radiation 
length units and can be changed.
eg: /exgflash/det/setLbin 20   1.    ---> 20 slices of 1. radl
    /exgflash/det/setRbin  5   0.25  --->  5 rings of 0.25 radl

     (MaxBin = 500 in both directions)	 

In ExGflashEventAction class the arrays corresponded slices and rings was
created and filled with hists information. This arrays was use to fill
histograms later.

VISUALIZATION
------------- 

The Visualization Manager is set in the main().
The initialization of the drawing is done via the commands /vis/...
in the macro vis.mac. To get visualization:
  /control/execute vis.mac


HOW TO START ?
--------------

- Execute ExGflasha in 'batch' mode from macro files
 % ExGflasha   test.mac

- Execute ExGflasha in 'interactive mode' with visualization
 % ExGflasha
   ....
  Idle> type your commands
  ....
  Idle> exit

The GFLASH activated via:

/GFlash/flag 1

HISTOGRAMS
----------

   ExGflasha produces several histograms:
   The histograms defined in ExGflashHistoManager class

     Content of these histo:

      h0 : energy deposit       per event
      h1 : the number of hits  per event
      h2 : the energy per hit ( in MeV )

      p0 : longitudinal energy profile
      p1 : radial energy profile

      p2 : cumulated longitudinal energy profile
      p3 : cumulated radial energy profile

 To define the output file name with histograms, use the UI command :

   "/analysys/setFileName name"

MACROS
------
The macros to run in batch mode:

test.mac - default macro for example testing

run01.mac - show how redefine the histograms
  
csi1.mac - macro which produce profiles in CsI Material

test0.mac - profile comparison, long run without GFLASH
test1.mac - profile comparison, long run with GFLASH on