Function tests pass for order 0 at tolerance 1e-10
Function tests pass for order 0 derivatives at tolerance 1e-10
Function   convergence rate at refinement 0: 2.1
Derivative convergence rate at refinement 0: 0.66
Function   convergence rate at refinement 1: 2.1
Derivative convergence rate at refinement 1: 0.88
Function   convergence rate at refinement 2: 2
Derivative convergence rate at refinement 2: 0.95