The total cumulative errors are:

 step size:    4.9999998882412911E-003
 with cumulative Error:    3.2767309178577813E-005

 step size:    9.9999997764825821E-003
 with cumulative Error:    2.1727484553387171E-005

 step size:    1.9999999552965164E-002
 with cumulative Error:    1.8595695793657835E-005

 step size:    3.9999999105930328E-002
 with cumulative Error:    8.8788535838297389E-005