AIRES library reference: Psi.

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 Psi (x)
c
c     Derivative of the logarithm of the Gamma function for real x.
c
c     S. J. Sciutto, La Plata 1994, 2004.
c
c<--->

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