AIRES library reference: spaddp0.

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
      subroutine spaddp0(pcode, pener, csys, ux, uy, uz, pwt, irc)
c
c     Adding a single primary particle.
c
c     Written by: S. J. Sciutto, La Plata 1999.
c
c
c     Arguments:
c     =========
c
c     pcode........... (input, integer) Particle code (AIRES coding
c                      system).
c     pener........... (input, double precision) Particle kinetic
c                      energy (GeV).
c     csys............ (input, integer) Parameter labelling the
c                      coordinate system used. 0 = AIRES coordinate
c                      system. 1 = Injection point-shower axis system.
c     ux, uy, uz...... (input, double precision) Direction of motion,
c                      with respect to the coordinate system selected
c                      by csys. The vector (ux, uy, uz) does not need
c                      to be normalized.
c     pwt............. (input, double precision) Particle weight.
c                      Must be equal or greater than one.
c     irc............. (output, integer) Return code. 0 means normal
c                      return.
c
c
c<--->

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