AIRES library reference: zfromadsty.

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 zfromadsty(adsty, layer)
c
c     Altitude from density. Multilayer atmospheric model.
c     The altitude is measured in meters above sea level (z=0), and the
c     atmospheric density is given in g/cm3.
c     The density range must lie within the exponential layers.
c
c     Written by: S. J. Sciutto, La Plata 2019.
c
c
c     Arguments:
c     =========
c
c     adsty........... (input, double precision) Air density in g/cm3.
c     layer........... (output, integer) An integer ranging from zero
c                      to nlayers + 1 indicating the atmospheric layer
c                      corresponding to the given depth. Layer 0 is
c                      returned when the altitude is negative, and
c                      layer nlayers + 1 is returned when depth is
c                      negative (no physical meaning).
c
c
c     Return value: (double precision) The vertical altitude in meters
c     ============  a.s.l.
c
c
c<--->

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