C FBG5      SOURCE    CHAT      05/01/12    23:57:10     5004           

             FUNCTION FBG5(T)
      IMPLICIT INTEGER(I-N)
      IMPLICIT REAL*8 (A-H,O-Z)

      t1 = t**70.D0
      t4 = t**5.D0
      t7 = 0.1005524820235976D1-0.2009049640471953D0/(0.307077455497043D
     #-89*t1+1.D0)-0.8036198561887811D0/(0.1903968584518355D-2*t4+1.D0)
      FBG5=t7
      RETURN
      END