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        complex(8) function zacosh (z)
        implicit none
  c april 1977 version.  w. fullerton, c3, los alamos scientific lab.
        complex(8) z, ci, zacos
        external zacos
        data ci /(0.d0,1.d0)/
  c
        zacosh = ci*zacos(z)
  c
        return
        end