Dawson integral
    X       Actual         Dawson(X)
  0.04    0.399574E-01    0.399574E-01
  0.16    0.157297E+00    0.157297E+00
  1.60    0.399940E+00    0.399940E+00
 10.00    0.502538E-01    0.502539E-01