AIRES library reference: spaddnull.

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 spaddnull(pener, pwt, irc)
c
c     Adding a "null" (unphysical) particle. This particle will not
c     be stacked, but its energy will be added to the unphysical
c     particle counter.
c
c     Written by: S. J. Sciutto, La Plata 1999.
c
c
c     Arguments:
c     =========
c
c     pener........... (input, double precision) Particle kinetic
c                      energy (GeV).
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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