FUNCTION BESY0(X)
C***BEGIN PROLOGUE  BESY0
C***DATE WRITTEN   770401   (YYMMDD)
C***REVISION DATE  840405   (YYMMDD)
C***CATEGORY NO.  C10A1
C***KEYWORDS  BESSEL FUNCTION,ORDER ZERO,SECOND KIND,SPECIAL FUNCTION
C***AUTHOR  FULLERTON, W., (LANL)
C***PURPOSE  Computes the Bessel function of the second kind of order
C            zero.
C***DESCRIPTION
C
C BESY0(X) calculates the Bessel function of the second kind
C of order zero for real argument X.
C
C Series for BY0        on the interval  0.          to  1.60000D+01
C                                        with weighted error   1.20E-17
C                                         log weighted error  16.92
C                               significant figures required  16.15
C                                    decimal places required  17.48
C
C Series for BM0        on the interval  0.          to  6.25000D-02
C                                        with weighted error   4.98E-17
C                                         log weighted error  16.30
C                               significant figures required  14.97
C                                    decimal places required  16.96
C
C Series for BTH0       on the interval  0.          to  6.25000D-02
C                                        with weighted error   3.67E-17
C                                         log weighted error  16.44
C                               significant figures required  15.53
C                                    decimal places required  17.13
C***REFERENCES  (NONE)
C***ROUTINES CALLED  BESJ0,CSEVL,INITS,R1MACH,XERROR
C***END PROLOGUE  BESY0