|   xi  |       ui using Romberg R5,2  |       Exact value of u(xi)  |       Absolute error  |    
|   0.0625  |       0.0625015  |       0.0625  |       
  |    
|   0.125  |       0.125  |       0.125  |       0  |    
|   0.1875  |       0.187513  |       0.1875  |       
  |    
|   0.25  |       0.250005  |       0.25  |       
  |    
|   0.3125  |       0.312536  |       0.3125  |       
  |    
|   0.375  |       0.375662  |       0.375  |       
  |    
|   0.4375  |       0.437571  |       0.4375  |       
  |    
|   0.5  |       0.500022  |       0.5  |       
  |    
|   0.5625  |       0.562618  |       0.5625  |       
  |    
|   0.625  |       0.625684  |       0.625  |       
  |    
|   0.6875  |       0.687676  |       0.6875  |       
  |    
|   0.75  |       0.750084  |       0.75  |       
  |    
|   0.8125  |       0.812746  |       0.8125  |       
  |    
|   0.875  |       0.875717  |       0.875  |       
  |    
|   0.9375  |       0.937827  |       0.9375  |       
  |    
|   1  |       1.00008  |       1  |       
  |