nag_specfun_integral_exp (s13aac) Example Program Results
     x           y
   2.000e+00   4.890e-02
   9.000e+00   1.245e-05
  -1.000e+00  -1.895e+00
  -1.000e+03 -1.798e+308
Error from nag_specfun_integral_exp (s13aac).
NE_REAL_ARG_LE:
  On entry, x = -0.100000000000000E+04 and
  the constant x_hi =  0.708300000000000E+03.
  The evaluation has been abandoned due to the likelihood of overflow.
  Constraint: x >= -x_hi.