FUNCTION RGAUSS(XMEAN,SD)
C***BEGIN PROLOGUE  RGAUSS
C***DATE WRITTEN   770401   (YYMMDD)
C***REVISION DATE  820801   (YYMMDD)
C***CATEGORY NO.  L6A14
C***KEYWORDS  GAUSSIAN,NORMAL,RANDOM NUMBER,SPECIAL FUNCTION
C***AUTHOR  FULLERTON, W., (LANL)
C***PURPOSE  Generates a normally distributed (Gaussian) random number.
C***DESCRIPTION
C
C Generate a normally distributed random number, i.e., generate random
C numbers with a Gaussian distribution.  These random numbers are not
C exceptionally good -- especially in the tails of the distribution,
C but this implementation is simple and suitable for most applications.
C See R. W. Hamming, Numerical Methods for Scientists and Engineers,
C McGraw-Hill, 1962, pages 34 and 389.
C
C             Input Arguments --
C XMEAN  the mean of the Guassian distribution.
C SD     the standard deviation of the Guassian function
C          EXP (-1/2 * (X-XMEAN)**2 / SD**2)
C***REFERENCES  (NONE)
C***ROUTINES CALLED  RAND
C***END PROLOGUE  RGAUSS