The basic xsection routines are in

         cppXsec0.f

which includes:

  p-p, pb_p, pi- p, pi+ p, k- p, k+ p

at  energies below 100 GeV by tables or formulas. 
AT higher energies, Particle data group formulas are used.
But they must not be used at e > 2x10**6 GeV for Pbar P and
e > 500 GeV for others.

These can be used for other incident particle or neutron target case.

         cppXsec.f

is for the entire energy region for the same collisions. At energies
> 1000 GeV (for pp,pbarp), or > 500 GeV (for others),
  if IncreaseXsec == 1 (default),
the power dependence of the lab energy is assumed. 
The power index is Deltpp, Deltpip, Delkp; defaults are
given by the block data 'blkxsectionp' in this file.

         cprotonAXsec.f

includes routines for a neucleus target case.  The value is
calculated from proton target case with a conversion process to
neuclus target case, which was made by some Glaubar theoretic
calculation.

         cxp2xAXsec.f

is for converting x-p xsection into x-A xsection.

         xp2xA.eps 

is to show calculated results for various vaulues of the proton target
xsection into neuclus target.


Example of Pbar -p and pbar air cross section


                momemtum GeV/c       pbar-p mb           pbar-air mb
 antip p =  20.4636048582137 xsxp=  39.2703450209532 xs=  289.596463219352
 antip p =  13.1435415901318 xsxp=  41.3400871661774 xs=  296.488469873637
 antip p =  10.4650922923639 xsxp=  42.6405422011888 xs=  300.671424752326
 antip p =  8.51164932889355 xsxp=  43.9886033577564 xs=  304.894840193714
 antip p =  6.29906698775885 xsxp=  46.2984030249793 xs=  311.881346782266
 antip p =  6.27392570027126 xsxp=  46.3322334956449 xs=  311.981436636977
 antip p =  5.70402661597025 xsxp=  47.1648882840341 xs=  314.425332687015
 antip p =  3.86545696820468 xsxp=  51.1898484665502 xs=  325.738442537117
 antip p =  2.95587042177492 xsxp=  54.6979506116936 xs=  334.984582355119
 antip p =  2.46594620411520 xsxp=  57.5088042148580 xs=  342.025038173995
 antip p =  1.79068507501717 xsxp=  63.6101997686763 xs=  356.316249170876
 antip p =  1.45506707546931 xsxp=  68.5806723166984 xs=  367.081431355479
 antip p =  .448176225721939 xsxp=  129.075209098377 xs=  460.355523164600
 antip p =  .201452624359320 xsxp=  249.554331003989 xs=  561.242988536569
 antip p =  .119241085714415 xsxp=  413.534715981282 xs=  639.986170504101
