C
C     ..................................................................
C
C        SUBROUTINE QL10
C
C        PURPOSE
C           TO COMPUTE INTEGRAL(EXP(-X)*FCT(X), SUMMED OVER X FROM 0
C                               TO INFINITY).
C
C        USAGE
C           CALL QL10(FCT,Y)
C           PARAMETER FCT REQUIRES AN EXTERNAL STATEMENT
C
C        DESCRIPTION OF PARAMETERS
C           FCT    - THE NAME OF AN EXTERNAL FUNCTION SUBPROGRAM USED.
C           Y      - THE RESULTING INTEGRAL VALUE.
C
C        REMARKS
C           NONE
C
C        SUBROUTINES AND FUNCTION SUBPROGRAMS REQUIRED
C           THE EXTERNAL FUNCTION SUBPROGRAM FCT(X) MUST BE FURNISHED
C           BY THE USER.
C
C        METHOD
C           EVALUATION IS DONE BY MEANS OF 10-POINT GAUSSIAN-LAGUERRE
C           QUADRATURE FORMULA, WHICH INTEGRATES EXACTLY WHENEVER
C           FCT(X) IS A POLYNOMIAL UP TO DEGREE 19.
C           FOR REFERENCE, SEE
C           V.I.KRYLOV, APPROXIMATE CALCULATION OF INTEGRALS,
C           MACMILLAN, NEW YORK/LONDON, 1962, PP.130-132 AND 347-352.
C
C     ..................................................................
C
      SUBROUTINE QL10(FCT,Y)
C
C
      X=29.92070
      Y=.9911827E-12*FCT(X)
      X=21.99659
      Y=Y+.1839565E-8*FCT(X)
      X=16.27926
      Y=Y+.4249314E-6*FCT(X)
      X=11.84379
      Y=Y+.2825923E-4*FCT(X)
      X=8.330153
      Y=Y+.7530084E-3*FCT(X)
      X=5.552496
      Y=Y+.009501517*FCT(X)
      X=3.401434
      Y=Y+.06208746*FCT(X)
      X=1.808343
      Y=Y+.2180683*FCT(X)
      X=.7294545
      Y=Y+.4011199*FCT(X)
      X=.1377935
      Y=Y+.3084411*FCT(X)
      RETURN
      END
