AIRES library reference: ghfx.

c
c     Routine directly callable from C/C++ (it could be necessary to
c     append an underscore, "_", to its name depending on the C/C++
c     compiler used).
c
c
      function ghfx(x)
c
c     Evaluating the Gaisser-Hillas function for the profile of charged
c     particles (T. K. Gaisser and A. M. Hillas, in Proc. 15th ICRC
c     (Plovdiv), vol. 8, p. 353 (1977)).
c     The four parameters Nmax, Xmax, X0 and lambda are set by means of
c     the routine "ghfpars".
c
c     Written by: S. J. Sciutto, La Plata 1999.
c
c
c     Arguments:
c     =========
c
c     x............... (input, double precision) The atmospheric depth
c                      (g/cm2).
c
c
c     Return value: (double precision) The value of the function at
c     ============  specified x.
c
c
c<--->

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