For testing dE/dx.
Main parameters:
In epicsfile  
            effective charge formula
  StoppingPw:  1   default.  If Srim data exists, use Srim
              -1   force to use formula 1, even Srim exists
  RecoilKeEmin:  100d-6 (100 keV).  dE/dx  is restricted one
              where recoil energy > this is not included in
              dE/dx.
                 1000.   toltal dE/dx is calculated.  and
                 can be compared if srim data at low energies
                 is smoothly connected to high energy.
  So combination to be tested. 
        StoppingPw     1            -1         -1
        RecoilKeEmin   100d-6     100d-6      1000
  


