New Version of the original CORSIKA
 ===================================
     Frank Schroeder (00/05/24)

  - Using CORSIKA version 5.945 (which is up to
    now not distributed by the Karlruhe people)

  - This Version includes many changes to earlier
    ones (most of them are described in
    Heck, D., Schroeder, F. et al., Proc. 26th ICRC,
    Salt Lake City, 1, 498 (1999) (HE 2.5.28)

  - The most important change for observations at
    large zenith angles is the new 'curved'-option.
    Using this, CORSIKA is now able to simulate
    air showers with its hadronic, electomagnetic (EGS)
    and cherenkov part up to 89 degrees zenith angle.

    TREATMENT:
    ---------
       Since the standard version of the air shower simulation code
       CORSIKA treats the shower development in a plane atmosphere,
       modifications have been performed for a complete simulation at
       large zenith angles.
       To avoid lengthy formulas for a treatment in a spherical coordinate
       system with corresponding long CPU times the description of particle
       transport is kept, but the horizontal step size is limited. Longer
       transport distances are subdivided into appropriate segments to be
       treated in a local flat atmosphere. After each traversed segment the
       particle coordinates are transferred into the next local Cartesian
       coordinate system with its vertical axis pointing to the center of Earth.
       Thus the curved Earth's surface is approximated piece by piece
       by flat segments with limited horizontal extension.
       When transferring the coordinates into the next local flat system,
       the atmospheric thickness makes a jump  due to the treatment in a local
       flat atmosphere. To keep this jump negligible
       (Delta(thickness)/thickness < 1% and Delta(thickness) < 0.5 g cm^2)
       a thickness dependent horizontal step size limitation is introduced.
       Thus the step size limit varies exponentially between 20 km at the
       top of the atmosphere and 6 km at sea level.
       (Additionally to the modified particle transport the Cherenkov photon
       tracks are corrected due to the atmospheric refraction using
       precalculated tables gained by numerical integration.)

  - Other changes are:
    * different possibilities for calculating zenith angle
      distributions for different detector symmetries (flat, volume and
      cylindrical detector) (Chirkin)
    * 4 out of 6 South Pole atmospheres available in the standard
      CORSIKA distribution have been selected using the MSIS-E-90
      model and can be used for calculations involving seasonal
      variations.(Chirkin)
    * new inelastic cross sections for QGSJET
    * treatment of low energy nuclei (E_nuclei/A < 80 GeV) now with superposition
      of single nucleons + Glauber theorie(cross sections and number of single
      nucleon nucleon interaction) + HDPM(new particles + distributions)
    * and tools for cherenkov photon production (refraction,...), ...