nag_monotonic_intg (e01bhc) Example Program Results
                                          Integral
          a                  b            over (a,b)
       7.9900            20.0000            10.7648
      10.0000            12.0000             1.9622
      12.0000            10.0000            -1.9622
      15.0000            15.0000             0.0000