AIRES library reference: spsetprimaryenergy.

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 spsetprimaryenergy(primener, irc)
c
c     Manual setting of the primary energy.
c
c     This routine may be called when the dynamical setting of the
c     primary energy is in effect. This means that the primary
c     particle is a special particle and that the input IDL
c     instructions do not include any PrimaryEnergy IDL directive.
c     In such cases, the primary energy will be automatically
c     set as the sum of the energies of all the particles injected
c     via the external particle module. The present routine is useful
c     when it is necessary to override that automatic assignment.
c
c     If the primary energy was assigned via IDL instructions, then
c     the settings of this routine are not taken into account,
c     returning a nonzero return code.
c
c     Written by: S. J. Sciutto, La Plata 2019.
c
c
c     Arguments:
c     =========
c
c     primener........ (input, double precision) The primary energy in
c                      GeV.
c     irc............. (output, integer) Return code. 0 means normal
c                      return.
c
c
c<--->

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