nag_struve_i1ml1 (s18gdc) Example Program Results
     x        I1(x)-L1(x)
   5.000e-01   2.040e-01
   1.000e+00   3.384e-01
   3.000e+00   5.568e-01
   6.000e+00   6.169e-01
   8.000e+00   6.260e-01
   1.000e+01   6.300e-01
   1.000e+02   6.366e-01