Build the "jscan" program: 
=========================
      Just use:
           > make
      If you lose the file "ams02_scan.root" or the geometry
      file "$AMSGeoDir/ams02.root" has been changed/updated, use:
            > root -b -q recreate_ams02_scan.C

Run the "jscan" program: 
=======================
            > jscan "AMS_Root_file(s)"

      Examples:
            > jscan ../files/test.root
            > jscan ../files/*.root
            > jscan  (will open a dialog to look for a file)

Comments:
========
      There are still many things to add to the program. It is in a 
      development phase.
      Most of the buttons should be self-explanatory. Try to see their 
      effect in case of doubts. Some conventions:

            - Colors for "TrTrackR" and "ParticleR" objects follow the 
              GEANT4 default convention:
                      blue ==> positive charge
                       red ==> negative charge
                     green ==> neutral particle

            - TOF and ANTI-coincidence clusters are shown in green. 
              TRD clusters, TRD tracks, RICH hits at the phtomultiplier
              plane and ECAL clusters not belonging to any shower
              are shown in cyan.

            - The initial MC particle (if any) is shown as a dotted 
              yellow line.

            - TRD hits are assumed to have an uncertainty of the order of 
              the TRD tube radius in both projections whenever it belongs 
              to a reconstructed TRD track. Otherwise, one of the hits 
              will be shown with an uncertainty of the order of the tube 
              length in the non-measuring projection.

            - Photon rays in RICH are shown with a given color
              (but not cyan), characterizong the RICH ring.

            - Hits inside ECAL showers are shown with a given color (but 
              not cyan), characterizing the shower.
              
            - Passing the mouse over most tracks or hits in the picture 
              triggers the writing of information about the object
              in the bottom pad.

            - Clicking with the mouse over a track or hit in the picture
              "freezes" the information, so you can take your time
              to read waht is written without caring about the mouse. This 
              information is cleared when you pass the mouse over 
              a different object.

            - When a hit inside an ECAL shower is clicked, 
              the corresponding shower information is written in the 
              bottom pad. When a hit inside an ECAL not belonging to any
              shower is clicked, the hit information is written 
              in the bottom pad.