SUBROUTINE HEAPSORT(N, RA)
C======================================================================*
C heapsort - sort data using the HEAPSORT algorithm
C
C This is the routine SORT from "Numerical Recipies". It takes
C as input the array RA of N real numbers and returns the array
C sorted in ascending order.
C
C From "Numerical Recipes" by W.H. Press, B.P. Flannery, S.A. Teukolsky
C and W.T. Vetterling, (Cambridge University Press, 1986), pg. 231
C======================================================================*
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C==EOF==