AIRES library reference: getfirstintdata.

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 getfirstintdata(vsl, fintdata, nshowers)
c
c     Returning first interaction data.
c
c     Written by: S. J. Sciutto, La Plata 2003.
c
c
c     Arguments:
c     =========
c
c     vsl............. (input, integer) Integer switch to select
c                      between vertical (vsl = 1) and slant (vsl = 2)
c                      depths. Any other value of vsl is equivalent to
c                      vsl = 1.
c     fintadata....... (output, double precision, array(5)) Array
c                      containing information about the first
c                      interaction:
c                         fintdata(1) --- Average X1.
c                         fintdata(2) --- RMS error of the mean.
c                         fintdata(3) --- Standard deviation.
c                         fintdata(4) --- Minimum X1.
c                         fintdata(5) --- Maximum X1.
c     nshowers........ (output, integer) Number of showers in the data
c                      set. If nshowers is less or equal than 0, then
c                      the array fintdata is undefined.
c
c
c<--->

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